I'll chime in for herb tea. Although I am not a teetotaler, I'm not the heavy beer drinker that I once was. Spearmint is my tea of choice. I find that the bite of the mint is a real refresher. And it makes a great iced beverage.

A word of caution about herbs. Some of them can be as powerful as drugs and several have drug interaction problems. Ginkgo & Echinacea are two that come to mind.