Mix flour and alum together in bowl. On the stovetop, mix the water, salt, vegetable oil, and food coloring or Kool-Aid. Once the mixture starts boiling, add the flour and alum.
Cook over low to medium heat stirring constantly until dough comes away from the edges of the pan and it becomes very hard to stir. Remove from heat and let cool slightly (until you are able to knead the dough).
Knead until smooth and elastic. Store in an airtight container.