Add crushed ice to glass or bowl. Then add cranberry juice. Wait for it to settle completely. Slowly and carefully add Diet Sprite - keeping a small consistent stream close to the glass while pouring. Wait for Sprite to settle. Then lastly add the blue Frost Gatorade keeping a small stream close to the glass. Then garnish with blueberries and strawberries, if desired.
Recipe by The Gingham Apron at https://www.theginghamapron.com/red-white-and-blue-drink/