Count the number of bulbs the family uses in your house. Now imagine 100 million homes like yours, each with the same number of bulbs as yours. Everyone in your family should. Water must be pumped to your home from rivers or reservoirs through long pipelines. Wasting water wastes energy as well as water.
Leaks also are wasteful.
For example, a leak that could fill a coffee cup in 10 minutes will waste more than 3,000 gallons of water a year. Read your meter. Ask someone to teach you how to read your water meter, if you have one. It probably will be in a corner of the basement, on an outside wall or under a concrete or metal cover near the street. Pick a time when everyone will be out of the house and no water is being used.