Most homemade play-dough recipes are variations on this most basic one.
1 cup of salt
1 cup of water
2 cups of flour
1 tablespoon of cooking oil
Mix the salt, flour, oil, & water together.
My addition: it was too thin to just play with, it needed to be cooked over medium heat for 2-3 minutes (or until it comes together in a soft, but not sticky, ball).
-Didn't become smooth even after kneading for many minutes
-Leaves a light residue, but wipes up easily
-Easy to make
-Sticks to fingertips something awful (maybe it needed to be cooked a bit longer)
2 weeks later:
Other posts in the play-dough experiment series:
Traditional (Baking Soda) Play-Dough