I usually just drink water, or don't have a chaser at all, but I have used those RzO drinks to wash away the kava aftertaste (for some of the more ucky kavas), as well as coconut water. Coconut water is definitely my favorite, I'll sometimes mix it in with the kava rather than use it as a chaser. Paradise's Fijian + coconut water tastes delicious, I would drink that just for the taste.