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How much water to store, and how to store it
Updated October 2026
If your water stops, drinking water is the first thing you will want. A little planning goes a long way.
How much to keep
UK Government advice is to have at least about 3 litres of drinking water per person per day, and 10 litres a day is a more comfortable amount because it also covers basic cooking and washing. You will need more for babies' formula, for medical needs, for pets, and in hot weather.
For two people for three days, that is at least 18 litres at the minimum, or about 60 litres to be comfortable.
You do not have to do it all at once. Start with one day's worth and add a day each time you shop.
What to keep it in
- Unopened bottled water is the simplest option. Check the date on the bottle and use older bottles first.
- Your own containers: use food-grade containers with a secure lid, washed clean before you fill them. Avoid containers that held milk or juice, as they are hard to get properly clean.
- Label and date them. Write "drinking water" and the date you filled them.
- Keep them cool and out of sunlight, and away from fuel, pesticides and other chemicals.
- Swap the water about every six months if you filled the containers yourself.
Know where your stopcock is
The stopcock turns off the water supply to your home, and it is often under the kitchen sink. Find it now and check it turns easily. If a pipe bursts, you will be glad you did.
If your supply stops
Use stored water for drinking and cooking first. Rainwater is not safe to drink untreated, but you can use it for flushing a toilet. Keep a little aside for washing hands.
What about filters and tablets?
Water filters and purification tablets can help if you ever have to make water from another source safe to drink, but for a few days at home, stored water is simpler and more reliable. If you buy either, follow the manufacturer's instructions exactly, and only use them for the amount and purpose they state.
Where this advice comes from
Quantities are from the UK Government Prepare website. Storage tips follow general guidance such as that from the US Centers for Disease Control and Prevention. This guide is general advice for ordinary households, not a substitute for official guidance. In an emergency, call 999.