You can have Sugar Free Rock Star Zero that has 0 calories but then try not to get too addicted to it. That’s the issue with energy drinks that they can easily become addictive. YOu can try Yoli drinks as well as they are Stevia sweetened drinks that are mixed with superfruits.
But as I said above, have it once or twice a week and try not to make it a daily ritual. WHY? Because this diet is too fragile to make any variation.