you will want it fresh.
get Trichocereus pachanoi... (san pedro). get a couple cuttings, plant them, keep them for a couple months after they root, keep them in the dark for a week untill they look like they are getting a little wrinkly... then eat 1/2 to 1 foot section prepared like the indians do it. i would explain it but you could just look it up on EROWID.com... it's my bible. its a great place.