just take a few B12 complex vitamins a day, drink a shit load of water, and smoke away brother, you will pass a PH pisstest (the kind most po pos give) but it might show up on a spesific gravity because of the weight of the water is lighter then regular piss. basicly if it goes to the lab, your fucked, but if they do it out of the pisscup infront of you with the stick or drop, your fine