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Chlorine Bleach
Bleach that contains a 5.25% solution of sodium hypochlorite and does not contain soap additives or phosphates can be added to water for long-term storage. Use a ratio of 1/8 teaspoon of chlorine bleach for each gallon of water.
2% Tincture of Iodine
Warning:
Ion
Ion is another method to preserve water. It is made of stabilized oxygen. Use 20 drops of ion per gallon of water.
Water storage should be changed approximately every 6 months, but in an emergency, treated water that has been left in containers longer is still safe to drink. When stored water tastes flat, pour it from one container to another a few times. This will re-oxygenate the water and make it more palatable.
Water Storage Methods
Water storage containers come in 5, 7, 15, and 55-gallon sizes and everything in between. If your budget has little wriggle room, you can store water in two-liter pop bottles. Do not store water in old milk cartons. They are biodegradable and will begin to break down within 6 months. Any leakage can destroy food storage items it comes in contact with.