Homemade+Playdough

Here's a simple recipe for making your own playdough at home like we made in class:
 * 4 cups flour
 * 1/4 cup salt
 * 1 1/2 cups water
 * 1 tablespoon cooking oil
 * 2 tablespoons of either alum or cream of tartar
 * 2 packages of Cool Aid (or 1/2 teaspoon of food coloring, or 1 tablespoon of powdered tempera paint)