Preheat oven to 350 degrees. Line muffin pan with paper baking cups. Combine cake mix, margarine or butter, egg whites and water. Mix on medium for 3-5 minutes. Divide batter evenly into separate bowls. Stir in 1/4 teaspoon of drink mix to each bowl to make 3-5 different colors. Pour batter into muffin cups, one color at a time, alternating with all colors into one, filling 3/4 full. Bake 15-20 minutes. Cool completely. For topping, combine whipped topping and unsweetened soft drink mix (optional). Spread onto cupcakes.
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