G FUEL Zero Sugar Energy Drink – Watermelon Limeade (473ml)
Designed for gamers to boost energy, focus, endurance and reaction time (it says here), G FUEL contains caffiene, anti-oxidants, vitamins, is "focus-amino fortified" (no, we have no idea what that means) and presumably has something in it to make it taste nice. In this case, of watermelon! All that and no sugar. Surprised they can fit it all in the can.