First, we got a glass mixing bowl (you could use plastic too) and we added 1 1/3 cups flour, 1/4 cup salt, 1/2 tsp cream of tartar and 2 packets of our favorite color koolaid. Don't use magical clear strawberry koolaid or lemonade-my sister found out the hard way, it doesn't yield a pretty playdoh. Mix all those dry ingredients together well with the utensil of your choice. We used forks.
Now boil 1 cup of water and 1 1/2 TBS of oil together. Pour the hot mixture into your dry ingredients and mix it all up. Pour carefully so you don't splatter the hot oily water on the curious little ones who want to see what your doing.
I suggest to start by trying to get all the dry mix from the bottom of the bowl first. That worked best for us. There will come a point where it will be difficult to mix the ingredients.
Have an adult empty the contents onto the table and knead it the way you would with bread. Caution: it will be HOT!! Once it is fully mixed, you should have a softball size worth of yummy smelling playdoh.
My daughter assured me it still has that salty tasting quality of store bought playdoh-dont ask! You can store it in a ziploc baggy or other container. I think next time I may half all the ingredients and make several new colors to replace our current containers full of mixed playdoh that no one wants to use. ENJOY!!