Here are some of my wild & crazy tried-and-true ways to save water.
I live in a small house in the Berkeley hills with a husband, 17-yr old child, in-and-out adult daughter, cat, and vegetable garden. Our household water usage averages 65 gallons per day for 3+ people. (Check out your own usage on your water bill.) The daily Californian average is over 200 gal/household.