Last updated: 15 July 2026
Editor’s note: Tesco stock can vary by store and over time. This guide is updated to help UK customers identify genuine distilled water and find suitable buying options.
If you have searched for distilled water Tesco, you are not alone. Many UK customers look for distilled water in supermarkets when they need purified water for CPAP machines, steam irons, humidifiers, car batteries, aquariums or laboratory use.
The short answer: Tesco may stock deionised water in some locations, but genuine distilled water is not consistently available as a standard supermarket product. If you specifically need distilled water with reliable low-mineral purity, buying directly from a specialist UK supplier is usually the simplest option.
Need Distilled Water Now?
Choose the size that suits your needs and order directly from our UK distilled-water range.
Does Tesco Sell Distilled Water?
Tesco commonly sells bottled drinking water, mineral water and spring water. Some stores may also carry deionised water, particularly within an automotive or household section.
However, genuine distilled water can be harder to find in major UK supermarkets because it is a specialist purified-water product rather than an everyday drinking-water product.
Availability may vary between Tesco stores and can change over time, so it is sensible to check the product label carefully or contact your local store before travelling.
If you need water for a CPAP machine, humidifier, steam iron, car battery, aquarium or laboratory application, check that the container is specifically labelled distilled water. Mineral water, spring water, filtered water and deionised water are not identical products.
Distilled Water at Tesco: Quick Comparison
| What you need | Tesco | Buy from us |
|---|---|---|
| Genuine distilled water | Not consistently available | Shop distilled water |
| Single 5L bottle | Availability may vary | Buy 1 × 5L |
| 10L total | Not normally available as a distilled-water multipack | Buy 2 × 5L |
| 15L total | Not normally available | Buy 3 × 5L |
| 20L best-value pack | Not normally available | Buy 4 × 5L |
| 25L container | Not normally available | Buy 1 × 25L |
| 50L total | Not available | Buy 2 × 25L |
| Trade or bulk supply | No | View trade supply |
Browse all distilled water products and buy online →
Is Deionised Water from Tesco the Same as Distilled Water?
No. Deionised water and distilled water are both purified waters, but they are produced using different processes.
Deionised water is normally purified using ion-exchange technology, which removes electrically charged mineral ions from the water.
Distilled water is produced by heating water into steam and condensing that steam back into liquid. This separates the purified water from minerals and many other impurities.
Both products are low in minerals, but they are not automatically interchangeable for every purpose.
Read the full guide: Distilled Water vs Deionised Water: What’s the Difference?
Why Is Distilled Water Hard to Find in Supermarkets?
Most supermarkets focus on drinking-water products such as spring water, mineral water and filtered bottled water. These products are intended mainly for drinking and are not the same as distilled water.
Distilled water is generally purchased for specialist applications, including:
- CPAP humidifier chambers
- Steam irons and garment steamers
- Humidifiers
- Car batteries and certain cooling systems
- Aquariums and controlled water preparation
- Laboratory, testing and technical applications
Because demand is more specialist, supermarkets may not stock distilled water regularly, particularly in larger 5L or 25L sizes.
For occasional home use:
For regular CPAP, humidifier or appliance use:
For best-value regular supply:
Where Can You Buy Distilled Water in the UK?
The easiest way to buy distilled water in the UK is usually through a specialist purified-water supplier.
At The Somerset Clear Water Company, we manufacture and bottle distilled water in Somerset for domestic, commercial and trade customers.
Available options include:
- 1 × 5L bottle for occasional household use
- 2 × 5L bottles for regular users
- 3 × 5L bottles for convenient multipack supply
- 4 × 5L bottles for frequent use and better value
- 1 × 25L container for higher-volume requirements
- 2 × 25L containers for professional and commercial use
- 1000L IBC supply for industrial and trade customers
Shop the full distilled water range now →
For more buying guidance, read: Where to Buy Distilled Water in the UK
Tesco Distilled Water Alternatives
If Tesco does not have distilled water available, you may see deionised water, mineral water, spring water or filtered water instead. These are not always suitable substitutes.
| Product type | Is it distilled water? | Common uses | Next step |
|---|---|---|---|
| Mineral water | No | Drinking water; not suitable where low-mineral water is required | Shop distilled water |
| Spring water | No | Everyday drinking | Buy genuine distilled water |
| Filtered water | No | General drinking use | Choose distilled water |
| Deionised water | No | Cleaning, automotive and technical applications | Compare the two |
| Distilled water | Yes | CPAP, humidifiers, appliances, batteries and technical use | Buy now |
What Is Distilled Water Used For?
Distilled water is commonly used where minerals in ordinary tap water could cause limescale, residue, deposits or unwanted changes to water chemistry.
CPAP Machines
Distilled water is commonly chosen for CPAP humidifier chambers because it helps reduce mineral deposits inside the water chamber. Always follow the device manufacturer’s instructions.
Read: What Water Should You Use in a CPAP Machine?
Buy 2 × 5L distilled water for regular CPAP use →
Steam Irons and Garment Steamers
Using low-mineral water may help reduce limescale and mineral residue in steam irons and garment steamers. Always check the appliance manufacturer’s instructions, as recommendations can vary.
Read: Best Water for Steam Irons UK
Buy a 5L bottle for steam irons and garment steamers →
Humidifiers
Distilled water can help reduce the mineral residue and white dust associated with using hard tap water in some humidifiers.
Buy 10L of distilled water for regular humidifier use →
Car Batteries
Distilled water may be used for maintaining certain refillable lead-acid batteries where the manufacturer specifies purified water. It should not be added to sealed or maintenance-free batteries.
Buy 5L distilled water for battery maintenance →
Aquariums
Distilled water may be useful as part of controlled aquarium-water preparation. However, it should not normally be added without suitable remineralisation and careful monitoring of water chemistry.
Buy the 4 × 5L pack for regular aquarium preparation →
Laboratory and Technical Use
Distilled water is used for a range of rinsing, preparation, testing and technical applications where ordinary tap water may introduce unwanted minerals.
Buy 25L distilled water for laboratory or technical use →
Can You Use Tesco Deionised Water Instead of Distilled Water?
It depends on the application and the equipment manufacturer’s instructions.
Deionised water may be suitable for certain cleaning, automotive and technical uses. However, where the instructions specifically require distilled water, use a product labelled as distilled water rather than assuming deionised water is an equivalent substitute.
This is particularly important for sensitive equipment, medical-device humidifier chambers and applications that require a specific purification method.
Before substituting one for the other, read: Distilled Water vs Deionised Water: What’s the Difference?
Which Distilled Water Size Should You Buy?
| Your likely usage | Suggested size | Buy online |
|---|---|---|
| Occasional household use | 1 × 5L | Buy now |
| Regular CPAP, humidifier or iron use | 2 × 5L | Buy now |
| Frequent household use | 3 × 5L | Buy now |
| Best-value regular supply | 4 × 5L | Buy now |
| Higher-volume professional use | 1 × 25L | Buy now |
| Commercial or frequent technical use | 2 × 25L | Buy now |
Why Buy Distilled Water from The Somerset Clear Water Company?
We manufacture and bottle distilled water in Somerset and supply domestic, business and trade customers throughout the UK.
Customers choose us for:
- UK-manufactured distilled water
- Consistent low-mineral purity
- Convenient 5L bottles and multipacks
- 25L containers for higher-volume use
- Bulk supply options for commercial customers
- Fast UK delivery
Ready to Buy Genuine Distilled Water?
Choose from single 5L bottles, multipacks, 25L containers and bulk commercial quantities.
Frequently Asked Questions
Does Tesco sell distilled water?
Tesco may stock deionised water in some stores, but genuine distilled water is not consistently available as a standard supermarket product. Availability can vary by location, so check the label carefully or contact your local store before travelling.
Is Tesco deionised water the same as distilled water?
No. Deionised water and distilled water are both purified waters, but they are produced using different methods. Deionised water is normally purified using ion-exchange technology, while distilled water is produced by boiling water into steam and condensing it back into liquid.
Read: Distilled Water vs Deionised Water: What’s the Difference?
Where can I buy distilled water in the UK?
You can buy distilled water online from specialist UK suppliers such as The Somerset Clear Water Company. We supply 5L bottles, multipacks, 25L containers and bulk quantities for domestic, commercial and trade use.
Can I use supermarket bottled water instead of distilled water?
Ordinary supermarket bottled water, including spring water, mineral water and filtered drinking water, is not the same as distilled water. These products may contain minerals that can leave deposits, limescale or residue in appliances and equipment.
Can I use Tesco deionised water in a CPAP machine?
You should follow the instructions provided by the CPAP manufacturer. Where distilled water is specifically recommended, it is best to use genuine distilled water rather than substitute deionised water without checking first.
Buy distilled water for regular CPAP use →
Can I use Tesco deionised water in a steam iron?
It depends on the instructions supplied with your iron or garment steamer. Some manufacturers recommend tap water, some permit distilled or demineralised water, and others advise using a mixture. Always check the appliance manual before changing the type of water used.
Read: Best Water for Steam Irons UK
Is distilled water suitable for humidifiers?
Distilled water is commonly used in humidifiers because its low mineral content can help reduce scale, residue and white mineral dust. Always follow the humidifier manufacturer’s instructions.
Can distilled water be used in car batteries?
Distilled water may be suitable for topping up certain refillable lead-acid batteries where the battery manufacturer specifically instructs you to add purified water. It should not be added to sealed or maintenance-free batteries.
Can distilled water be used in aquariums?
Distilled water can be used as part of controlled aquarium-water preparation, but it should not normally be added on its own without suitable remineralisation. Fish and aquatic plants require appropriate mineral levels, pH and water chemistry.
What size distilled water should I buy?
A 5L bottle is convenient for occasional household use. Multipacks may suit regular CPAP, humidifier or steam-appliance users, while 25L containers are better for higher-volume requirements. Commercial and industrial customers may prefer bulk or 1000L IBC supply.
Compare sizes and buy online →
How should distilled water be stored?
Keep distilled water sealed in its original container and store it in a cool, clean place away from direct sunlight, strong chemicals and potential contamination. Replace the cap securely after use.
Looking for Genuine Distilled Water?
Order directly from a specialist UK manufacturer. The Somerset Clear Water Company supplies distilled water in 5L bottles, multipacks, 25L containers and bulk commercial quantities.