Oh I just found the best idea thanks to pinterest! Flavored Spa Water. So simple and easy too. Here is the link:
I want to make the rosemary and watermelon one on Tuesday. Monday is a Holiday here in Germany and the stores are all closed. I love my slightly fizzy water, and 0,19 cents for a 1,5 Liter bottle isn't bad but it does tend to get slightly boring drinking nothing but water all day. So the idea of these simple spa waters amaze and excite me. And I love watermelon, never thought to combine it with rosemary though.