Best Energy Drinks For Caffeine-Dependent Americans?

Hey all; leaving for thirteen days across Japan in about two weeks. I drink a Celcius brand energy drink every morning at the exact same time, and would be a liar if I said I hadn't developed a dependency on these little fruity energy blasts. Does anyone have any good recommendations for similar flavor profile drinks?

Sweet but not too sweet, not too acidic, and preferably strawberry/watermelon/orange flavors.