This is something I save for a hot day with the littlest ones when I don't want to drag out a kiddie pool and watch their every move. I got out random containers from the recycling and our cabinets, measuring spoons, stirring spoons, cups, you name it. Then I fill a bunch of them (but not all) with water and let them go to town. They LOVE this and have such a ball making a big, wet, mess. Finally the water all ends up spilled out and we clean up everything. It's not a lot of work and it keeps them entertained for at least 30 mins.