SPORTea. This stuff is good! It is a bit pricey but it is refreshing....and without caffeine (well, very little) or sugar or anything processed.
I first heard about it from a friend who lived in Boulder. At that time it was a bit difficult to find; however, now it is in grocery stores here. And, if you want it already prepared, it is sold at our local Alterra coffee shops.
It's a favorite at this house.