There are many ways for you to teach your kids how to save water. Turning off the water while brushing their teeth an shortening shower time. There are resources to help you teach kids at:
http://saveourwater.com/what-you-can-do/kids/ Check out the resources and examples for kids.
“You use water every day at home. Brushing your teeth, washing out your milk glass, taking a shower or bath—all of these activities use water. But water is a limited resource. We Californians can’t afford to waste even small amounts of water. You can help save California’s water by changing the way you use water inside and outside your home.” Read more
Also make sure that you have quality clean water for your kids by using a whole home filtration system in San Diego and Orange County.