Install Faucet Aerators. They use less water, even if you're turning on the taps for the same amount of time. You should be able to get faucet aerators for less than two dollars apiece. Chances are you already have some form of aerator in your faucet (they're those little mesh screen pieces that screw onto the nozzle). If you already have them, you can unscrew them and check the side for their gpm (gallons per minute) rating. If it's over 2.75 gallons, it's probably worth it to get one with a better, lower rating.

Repair Faucet Leaks. A leaky faucet can waste 1000-2000 gallons of water a year.

Utilize Greywater. Save unused drinking water, capture water while you're waiting for the shower to heat up and hang on to your cooking water, then use it to water your plants.

Insulate Pipes. Cover your hot water pipes with foam insulation to prevent heat loss. The pay off is faster hot water and less water waste.

Place Your Hot Water Heater Close to Where You Use It. The shorter the distance the water has to travel, the faster you'll have hot water. Less time waiting equates to less water wasted.

Install a Tankless Hot Water Heater. When it's time to replace your hot water heater, consider upgrading to a tankless unit (also known as an on-demand water heater). It heats water faster and only when you need it, a water savings and an energy savings.

Do you have a fish tank? If so don't throw the dirty water down the drain when you clean it. Instead use the water for your houseplants, not only are you conserving water by using it twice, but the nitrogen and phosphorous rich water is a great fertilizer for plants.