Put a washcloth in a bowl filled with water. Have your children take turns soaking the cloth and squeezing it into an empty glass. Who can squeeze out the most water? Now place a small rock in the bottom of the bowl. Ask your kids what kind of strength it would take to squeeze water out of the rock.
When God provided water to the Israelites in the desert, He was giving His people a lesson on His power. He was also providing a picture of how Jesus would someday satisfy our needs. Jesus, the Rock, satisfies our spiritual thirst.