Perhaps the best thirst quencher on our planet, Earth (besides water).
That is a pretty big claim. Let's exclude libations. And coffee. It is pretty awesome even if you want to argue with me. What is this miracle elixir? I'll give you 3 hints: watermelon, lime and mint.
Fill a blender with chunks of cold, fresh watermelon. Add the juice from 1/2 a lime. Throw in a few sprigs of fresh mint, chopped. Blend it all up (you can add ice if you'd like). Pour yourself a glass. Straw optional.