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 cabinet purifies water. Add 20 drops per gallon of clear water or 40 drops per gallon of cloudy water. Water purification tablets.
Tablets are available at drug stores.
Follow the manufacturers' instructions. Boiled water, stored in sterilized containers keeps for six months to one year. While the water may taste flat, it is safe to drink or use in cooking. Your hot water heater or water pressure tank could supply many gallons of safe water. Before using water from the water heater, switch off the gas or electricity, which heats the water.