A kitchen timer is a handy reminder for turning off sprinklers.
Position your sprinklers so water lands on the lawn and garden, not on paved area. Use a coarse spray to reduce evaporation.
Plant drought-resistant trees and plants. Many beautiful trees and plants thrive with little watering.
Put a layer of mulch around tree and plants. Mulch slows evaporation of moisture and discourages wee growth.
Use a broom, not a hose, to clean driveways and sidewalks.
Don't run the hose while washing your car. Clean the car with a pail of soapy water. Use the hose just to rinse off.
Check for leaks in pipes, hoses, faucets, and couplings. Leaks outside the house can be as wasteful as leaks inside, so check frequently and make the necessary repairs. Be sure the hose faucet is tightly turned off after each use.