IMO I'd highly recommend that you don't attempt to make tea out of powdered cactus. I've tried it. I've had friends that have tried it. If the cactus is powdered, all that will happen, no matter how long you boil it, all that will happen is the cactus powder will simply absorb the matter and become a thick, giant, goupy cactus soup that is even more difficult to consume than eating a pound of dried cactus(the amount of dried San Pedro powder required to actually give you the full mescaline experience as it is usually far less potent then peyote). You can try things like incapsulating several pounds of cactus and swallowing that incredible amount of fiber but the human body cannot process all that quick enough, and you will end up with an annoyingly weak trip that will last for a very very long time (mescaline already has quite a duration under it's belt anyways) as it is slowly digested by your body. It is significantly weaker than peyote so it cannot be consumed in the same way. Cactus teas CAN be made but please, for your own sake, don't try and make tea out of it. If your using anything else besides peyote, IMO, an extraction is absolutely required. IF IT DOES/DID WORK, please let me know. I would really like to be wrong on this haha