Root powder and juice? No way. However, I've used instant formulas like Fire Island and Shaman, and especially Kava King, in juice. My current favorite instant is Kava King Berry (discontinued, so I purchased 36 tins at a huge bulk rate last April and am about 70% done), mixed with Life Extension Foundation's Neuro-Mag powder, which has a lemon taste. Both are flavored with stevia. The sour of the lemon and the bitter of the kava mix with the citrus and berry to have a rather interesting flavor. They both promote an increase of IQ and a reduction of PTSD.