A cornstarch and water mixture known as "Goop" can be made at home using:
2 cups of water in a large bowl or plastic storage container
Add a little food coloring (not very much or it will stain clothing)
Pour in 4 cups of cornstarch slowly
Mix as you add cornstarch. Try mixing with your hands as it turns from solid to liquid.
Clean up: Washes off easily with water or let dry and it will turn into powder.
Put smocks on the children.
Add items to the mixture such as small containers, kitchen utensils, funnels, spoons, plastic knives, animal figures, people figures ........
Make enough for all the children and yourself to play!