Preheat oven to 350 and coat a 9x13 baking dish with non-stick cooking spray.
Combine cake mix, water, eggs, water, buttermilk and oil until smooth.
Spread evenly into baking dish, bake about 25 minutes or until a toothpick insterted in center comes out clean.
Remove from oven and let cool for 15 minutes.
Combine 1/2 package (about 2 tbsp. red gelatin and 1/2 cub boiling water and stir about 2 minutes until dissolved, add 1/4 cup cold water and stir to combine.
Use a wooden skewer or large fork and poke holes into cake about every 1/2 inch.
Carefully pour gelatin over cake.
Combine 1/2 package (about 2 tbsp. blue gelatin and 1/2 cub boiling water and stir about 2 minutes until dissolved, add 1/4 cup cold water and stir to combine.
Carefully pour gelatin over cake.
Place in refrigerator at least 4 hours or overnight.