Make three batches of the stew and color each batch with either red, yellow or blue food coloring. Cool completely before putting in the baggies. Food coloring-either red, yellow or blue. Use at least 1-2 teaspoons of liquid food coloring for intense color. When cool, put a spoonful of each color in the baggie, push out air and seal.
Children can blend colors as they squish with the baggie with their fingers.