Try this recipe for quick home-made playdough:
1 cup flour
1/2 cup salt
2 tsp cream of tartar
1 cup water
1 T oil
Mix all the ingredients in a large saucepan over medium low heat, and stir constantly. When the dough is stiff (it only takes a few minutes), turn it out on to your counter and knead until cooled. You can add food coloring, or even a packet of KoolAid for color and scent! This soft "dough" will keep for several months if it is stored in the refrigerator in an air-tight container.
The dough cleans up easily with soap and water, doesn't stain, and is nice and pliable. I love cheap stuff like this, that keeps little ones busy for a long time!