Water can be purified by boiling or by chemical treatment. Boiling Boil water at a rolling boil for at least 10 minutes to kill any disease causing bacteria in the water. Add a pinch of salt to each quart of boiled water to improve the taste. If water cannot be boiled, treat it chemically. Chlorine Bleach such as Clorox or Purex.
Household bleach is a good disinfectant for water.
Let it stand for 30 minutes. The water should have a slight chlorine odor. If it doesn't, repeat the dose and let the water stand for an additional 15 minutes. Household iodine from the medicine chest of first aid kit will purify water. Add 20 drops per gallon of clear water, and 40 drops per gallon of cloudy water.