Storing water: supplies, shelf life, emergencies

How much of a supply makes sense

The German Federal Office for Civil Protection (Bundesamt für Bevölkerungsschutz) recommends a water supply of 2 litres per person per day for ten days, so 20 litres per person. Part of this is for drinking, part for cooking. If you have pets, include them. The supply is not for the end of the world, but for a burst pipe in your town, a power cut at the waterworks or a contamination that leads to a boil-water notice.

How long water keeps

Water does not “go off” like milk. It takes on taste from the container, loses carbonation and can pick up germs if light and warmth are added. A best-before date is a formality on glass and, on PET, a hint about the taste.

Storing tap water properly

1. Use food-grade containers, not old cleaning-product containers.
2. Clean the container with hot water and a little washing-up liquid, then rinse thoroughly.
3. Fill it to the brim with cold water that has run for a minute or two, with no air left in.
4. Store it cool, dark and frost-free: cellar, pantry, utility room.
5. Write the date on it and replace the water after six months. The old water is good for watering plants and cleaning.

Water in the car and on hikes

PET bottles in a hot car release more substances from the plastic, and the water tastes of the bottle. This is not dangerous, but it is unpleasant. For on the go, a stainless steel or glass bottle is better, see Choosing a reusable water bottle.

When water gets scarce

Under a boil-water notice, boil first, then let the water cool and keep it in clean containers. When boiling is necessary and for how long is covered in the article When should you boil water?