You can store your water in thoroughly washed plastic, glass, fiberglass or enamel-lined metal containers. Never use a container that has held toxic substances, because tiny amounts may remain in the container's pores. Sound plastic containers, such as soft drink bottles, are best.
Before storing your water, treat it with a preservative, such as chlorine bleach, to prevent the growth of micro-organisms. Use liquid bleach that contains 5.25% sodium hypochlorite and no soap. Add four drops of bleach per quart of water (or two scant teaspoons per 10 gallons), and stir. Seal your water containers tightly, label them and store them in a cool, dark place.
Another method to store water is to simply purchase bottled water and leave the seals intact, but remember to rotate your water every six months or as date stamped on the bottles.