Use Dishwashers only when they are full. Washing dishes by hand (don’t let the tap run!) saves about 25 gallons.
Adjust water level on clothes washing machines, if possible. Use full loads only, if not adjustable.
Turn off faucets while brushing teeth, etc. Saves about 5 gallons per day.
Reduce water used per flush by installing toilet tank displacement inserts: a plastic jug may often be used as an alternative. Do not use bricks – they disintegrate when soaked and the resulting grit hinders closing of the flap valve.
Do not use the toilet as a trash can.
Use sink and tub stoppers to avoid wasting water.
Keep a bottle of chilled water in the refrigerator for drinking.
Find and fix leaks in faucets and water-using appliances. Faucets can usually be fixed cheaply and quickly by replacing washers.
Adapt plumbing with flow restricting or other water using devices. These are usually inexpensive and easy to install.
Learn to read your water meter so you can judge how much water you use and what differences conservation makes.
Take shorter showers and shallow baths. Saves about 25 gallons.
Reduce the number of toilet flushes per day. Each flush uses about 5 gallons (2-3 if you have water saving toilets).
Don’t use a garbage disposal.
Use non-phosphate detergent and save laundry water for lawns and plants.