Proper Water Storage
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. You can also purchase food-grade plastic buckets or drums.
Before storing your water, treat it with a preservative, such as chlorine bleach, to prevent the growth of harmful microorganisms. Use liquid bleach that contains 5.25 percent sodium hypochlorite and no soap. Some containers warn, "Not for Personal Use." You can disregard these warnings if the label states sodium hypochlorite is the only active ingredient and if you use only the small quantities in these instructions.
Add four drops of bleach per quart of water (or two scant teaspoons per 10 gallons), and stir. If the water does not taste and smell of chlorine after 30 minutes, add another dose of 1/8 teaspoon and let stand another 15 minutes. Seal the containers and label with contents and date of preparation and store them in a cool, dark place.