Here are a couple of math questions to help you learn how easy it is to waste water and how easy it is to save it.
Many restaurants serve water to all of their customers.
The customers often drink milk, juice, or soda, and do not drink the water. Suppose that Gil forgets to use a bucket, and washes his dad's car using water coming out of the hose at full volume, or six gallons of water per minute. It takes Gil 15 minutes to finish. Peter washes his dad's car in 10 minutes, using a hose with a shut-off sprayer, and uses only three gallons of water per minute. Each boy will wash their dads' cars once a week for a year.