Reduce the water level per flush by installing a water displacement device in the toilet tank. Install water saving shower heads or flow restrictors, which are available at local hardware stores and other retail outlets. Avoid letting the faucet run by turning off the water after wetting your toothbrush and using a glass of water to rinse. Rinse your razor in a sink of water. Letting the water run uses about three gallons per minute.
Small changes can equal big savings.
Turn the dishwasher on only when it's full. Clean vegetables in a pan of water, not under a running faucet. The water collected can be used for your household plants. Keep a bottle of drinking water in the refrigerator. Now there is no need to run the tap to get a glass of cold water.