Turn off the water after you wet your toothbrush. There is no need to keep the water running while brushing your teeth. Just wet your brush and fill a glass for mouth rinsing.
When washing dishes by hand, don’t leave the water running while scrubbing the dishes.
Use your dishwasher and clothes washer for only full loads.
Install low flow faucet aerators and water saving shower heads which use less water than traditional versions.
Take 5 minute showers instead of a full bath.