Place dry cake mix and dry pudding mix in a large bowl. Blend with a whisk. This makes about 4 to 4 1/2 cups of dry mix. Divide mix into 8 small plastic bags (about 1/2 cup each). Place mix into a corner of each bag and tie it there with a twist tie.
Make glaze mix: In a medium bowl, combine powdered sugar and lemonade mix. Divide into 8 small plastic bags and close bag with a twist tie. Attach each glaze mix to the cake mix bags with a twist tie. Place one set of bags into each cup. Be sure to use a cup big enough to hold at least 1 1/2 cups of water.
Attach the following instructions to each cup:
For Cake in a Cup: Generously spray inside of cup with cooking spray. Empty contents of cake mix packet in cup. Add 1 egg, 1 Tbsp. oil, and 1 Tbsp. water. Mix 15 seconds, carefully mixing in all dry mix. Microwave on full power for 2 minutes. While cake is cooking, place ingredients from glaze into a small container and add 1 1/2 tsp. water. Mix well. When cake is done, pour glaze over cake in cup. Enjoy while warm.