Anna's Super Awesome Long-Lasting Play Dough

Our dear friend Anna gave us an awesome play dough recipe we'd like to share.  We simply love it. 

1. Mix 2 cups of flour, 1/2 cup of salt, and 2 Tablespoons cream of tartar.  
2. In a large measuring cup add any scent, spice, or color you like.
3. To this add up to 2 cups boiling water.
4. Add 2 Tablespoons oil and 1 1/2 cups of the water.
5. Mix and add more water if you need.
6. As it cools, turn on to the counter and knead.
7. If it starts to dry out you can add a little oil to it.