Squeeze some lemons, add a bit of sugar and mix. Top off with carbonated water. Adjust ingredients to taste.
Ooh, carbonated water... or tonic water, which is lemony and somewhat bitter?
How about something for the winter. Like a quarter pound of cinnamon sticks infused (i.e. hot water steep), a few whole cloves, a couple chunks of Dragonfruit, Dragonfruit juice, and sliced ginger root?
No hot, heady, spiced drinks here?