To install a new showerhead, simply unscrew the old one and screw on the new one using Teflon tape to seal the threads. Take shorter showers or shower less often. Don't run the water full force when showering. Turn the shower off while soaping or shaving. Keep the water shallow when using the tub.
Baths can sometimes actually save water compared with long showers.
Kitchen Saving water in the kitchen is easy with a low-flow faucet aerator and a few new habits. When selecting a low-flow faucet, keep in mind that flows less than 2.5 gallons per minute are inconvenient at a kitchen sink when you are trying to fill pots or wash dishes. A dual flow faucet is the best choice for kitchens. Hand-wash dishes in a basin instead of under running water. Store a container of water in the refrigerator to avoid running water each time you want a cold drink.