My children cannot get enough of water play in the summer. In my mudroom I keep a small stack of these clear plastic containers along with 2 white ice cube trays, a stack of plastic cups and a handful of basters for when I need a 30-minute activity. I simply add food coloring to the 3 containers of water and let them mix and play. If you are brave, set this up inside your house on a towel. To be clear, I don’t ever do this as all of our water play occurs outside!