Kombucha, tea, water kefir, coconut water. Don't think you don't like one until you try lots of flavors, styles, etc. Making your own is sooo much cheaper too!
Kombucha - hibiscus, lemon ginger
Tea - most oolongs, kukicha green (though I enjoy so many more), chai
Water kefir - lemon
Coconut water - Amy and Brian's
You can get a kombucha scoby and kefir grains, plus instructions at Cultures for Health: Yogurt Starter, Sourdough Starter, Kombucha, Kefir Grains, Cheese Making and more | Supplies for a Real Food Lifestyle. Regarding tea, you would probably prefer black tea for stronger flavor. It does have caffeine but the amount depends on the type. Golden Needles has less than something like Earl Grey (not one I like.)