You will need:
1 c flour
1 c water
1/2 c salt
2 tsp cream of tartar
1 T oil
food coloring
Mix the dry ingredients then add the oil, water, and food coloring. Heat in a pan on the stove top until the mixture forms a ball. Let it cool briefly and then knead until it is soft and cohesive.
Then let the fun begin!
There is also an edible version which I have never tried since it would send my other children into anaphylactic shock. Here it is:
Edible Play Dough
1 1/2 c peanut butter
1 c powdered milk
1 c powdered sugar
Mix together until it becomes clay-like. Enjoy!