We've made rainbow rice before, both with water and food coloring and with vinegar and food coloring. This time we made it with Kool-Aid and water which is by far the very best way because it smells incredible. For each 2 cups of rice, we used 1 package of Kool-Aid and 2 Tbsp of water. Throw it all together in a gallon bag and shake it up (it works best if you mix the Kool-Aid and water together before you pour it over the rice). Spread it out on aluminum foil, plastic wrap or parchment paper to dry. It only took about 15 minutes to dry completely. And our kitchen smelled amazing!