Use the minimum amount of water needed for a bath by closing the drain first and filling the tub only one-third full. The initial burst of cold water will be warmed by the hot water as the tub fills.
In the shower, turn the water on to get wet, turn off to lather up, then turn back on to rinse off.
When adjusting water temperatures, instead of turning the water flow up, try turning it down to balance the temperature.
Turn off the water as you brush your teeth, wash your face or shave.
Avoid flushing the toilet unnecessarily. Dispose of tissues, insects and other such waste in a trash can rather than in the toilet.