Well...if it were me I would go down to wal mart and buy a self testing kit and see where your at. If you took a puff or two and I mean a puff or two you might slide by. But at this point it is to late for you to order synthetic urine. I would say avoid fatty foods, do not exercise cross your fingers and drink water but not tons perhaps 7 glasses between now and tomorrow. Remember when giving someone your own urine make sure you catch the middle of your urine stream it is the cleanest!