1 cup water
1 tablespoon vegetable oil
1/2 cup salt
1 tablespoon cream of tartar (necessary as a preservative; will keep the play-doh fresh for 6 months)
food coloring
1 cup flour
Combine water, oil, salt, cream of tartar, and food coloring in a saucepan and heat until warm. (I usually heat it until the salt dissolves).
Remove from heat and add flour. Stir to combine. Knead until smooth.
Store dough in an airtight container or Ziploc bag.
NOTE: I quadruple this recipe every time I make it.