Place water in a container then carefully place a rock of dry ice in it for the child to be surprised with the experiment.

I made a few different containers with water and added different colors of food coloring to make it more fun. I also added a small strainer to give it a different way to playing with it! Be careful with the dry ice as it can burn if held for too long. I used tongs to handle it. Do not let a child play directly with the dry ice.