The bathroom is where you can make the most substantial reduction in personal water use. More than 50% of the water used in an average home is used in the bathroom. (http://www.epa.gov/watersense/waterefficiency/whatyoucando.html)
1. Stop using the toilet as an ashtray or wastebasket. Everytime you flush a cigarette butt, facial tissue, or other small bits of trash, you waste 5 to 7 gallons of water.
2. Take shorter showers. Long, hot showers can waste 5 to 10 gallons every unneeded minute. Limit your showers to the time it takes to soap up, wash down, and rinse off.
3. Reduce flushing water. Put an inch or two of sand or pebbles inside each of two plastic bottles to weigh them down. Fill them with water and put them in your toilet tank, safely away from operating mechanisms to reduce the fill amount.
4. Install water-saving showerheads or flow restrictors. Your local hardware or plumbing supply store stocks inexpensive water-saving showerheads or restrictors that are easy to install.
5. Take baths. A partially filled tub uses far less water than a long shower, but a short shower uses less than a full tub.
6. When shaving and brushing your teeth, don't leave the water running. Run as much as you need, then turn off the tap until you need more.