I tried this out today and it worked great!
1 cup flour
1 cup water
1/4 cup salt
1 tablespoon oil
(2 tablespoons cream of tartar) -I didn't have this, but I bet this would have made the consistency smoother
Mix all the ingredients and cook over medium-low heat until it comes together and is no longer sticky. Cool down before using.
Sebastian had a blast playing with the dough. Granted, he mostly just stabbed it with a knife and had me build Donald Duck (x3), a dog (x2), Brobee, Plex, Mickey Mouse, and Toodles. He would then take them apart, say "uh oh" and have me build something else. He is a cutie patootie!