need this Warning: Fun Dinner Night Ahead! Cook spaghetti noodles, drain and cool. Fill a gallon Ziplock bag one quarter of the way with water. Add food coloring to the water. Add part of cooked spaghetti and mix around in the ziplock bag until noodles change color. Drain, repeat with other colors. Place the noodles in separate bowls. food coloring + normal spaghetti. kids would LOVE this!