If water is cloudy, only heat sterilization can be fully relied upon to assure complete destruction of these organisms. Liquid household chlorine bleach can be used to purify water provided the label says that it contains hypochlotie as its ONLY active ingredient. Add 2 drops of bleach per quart or 8 drops per gallon and let stand for 30 minutes. If the water doesn't taste and smell of chlorine at that point, add another dose and let stand for 15 minutes. If the water is cloudy you may double the dosage.
Liquid bleach loses strength over time.
In one years storage you must put in double the amount of bleach as new bleach. Two year old bleach must not be used. It is not potent enough to kill bacteria. After adding bleach to water, stir and let stand for 30 minutes. They are also sensitive to heat and light.