Explain to your preschooler that water is a limited resource and that it is important to never waste water.
Turn off the faucet when your preschooler is brushing his teeth. Even adults waste water this way, and teaching your preschooler good habits when she is young will help encourage water conservation habits for a lifetime.
Fill your preschooler's bath water up only about eight inches. This is a safer amount of water, and your preschooler can have just as effective and enjoyable a bath. Be sure to explain that using only the amount of water needed is important to protect this precious resource.
Show your preschooler how to collect water in buckets and rain barrels to use to water the garden.
Let your preschooler help you wash your car. Fill a bucket with water, rather than using the hose, to save water.