a lot of cactuses that grow all over the place have mescaline in them. I don't think you'll find any peyote buttons, but if you don't mind drinking a smoothie that's the consistency of cement or something, then go for it. just look up the cactus pictures and cut yourself a piece off and freeze it, peel the skin off, and put that shit in a blender with some ice cream. I dunno I dont personally recommend it, but if that's what you're looking for, go for it.
take it easy