the ready clean works. anything with niacin will clean you out. i drank one and then 4 liters of water and pissed like 9 times. dont eat tho, because i shit myself while at the grocery store after eating a salad with my gf, which was horrible, it was all water, but it really flushes your system, so food is a bad idea, but it works, i passed, and i went to the lab for a unrinalysis. so just stay calm and youll be fine. or get your buddy to piss in a ziploc and tape it to your leg if you really dont trust the drink. itll hide it and keep it around body temp so they dont get suspicious of cold urine...either way good luck bro ++ vibes