Do not turn on the gas or electricity when the tank is empty. You'll need to shut it off to stop contaminated water from entering your home if you hear reports of broken water or sewage lines. In addition to having a bad odor and taste, contaminated water can contain microorganisms that cause diseases such as dysentery, cholera, typhoid and hepatitis. You should therefore purify all water of uncertain purity before using it for drinking, food preparation or hygiene. There are many ways to purify water.
None are perfect.
Often the best solution is a combination of methods. Before purifying, let any suspended particles settle to the bottom, or strain them through layers of paper towel or clean cloth. Three easy purification methods are outlined below. These measures will kill microbes but will not remove other contaminants such as heavy metals, salts, most other chemicals and radioactive fallout. Boiling is the safest method of purifying water.