1/2 cup cornstarch, 1 cup baking soda, 3/4 cup water, a small saucepan, and a spoon. Heat the mixture over medium heat and stir constantly. Remove from the heat and let the clay cool until you can handle it comfortably. Knead it for a minute to make it really smooth. Shape. Bake at 250F (121C) for 30 minutes...longer if project is thick.