DD brought home this recipe for playdough.
It has a great texture, much nicer than shop-bought.
1 cup plain flour
2 teaspoons cream of tartar
half cup salt
1 tablespoon oil
1 cup water
2 teaspoons food colouring
Mix ingredients in a pan, to smooth paste. Cook slowly until forms ball. When cool, knead for 3-4 minutes. Will keep for several months in a plastic bag in the fridge.
Not sure about the salt; I'll experiment with lesser amounts and see if it still works.