Here is a step-by-step tutorial on how to make watercolor paint:

1. In a mixing bowl, mix 4 tablespoons baking soda with 2 tablespoons vinegar until fizzing stops.
2. Stir while adding 1/2 teaspoon corn syrup & 2 tablespoons cornstarch — it is a crazy texture that feels solid until you stir it. Continue mixing until a uniform consistency.
3. Add food coloring or liquid watercolors to the mixture.
4. Mix well.
5. Pour the mixture into an empty paint palette or small containers.

This recipe is from kidsactivitiesblog.com. I hope this helps!