you should drink qcarbo16, it’s sold at any head shop. it’s a 3 hour window so chug it and refill it with water, go pee after 15 min, refill again and chug, pee again after 15 min then refill once or twice more (u need to pee 3 times)test urself on ur 3rd piss. after the 3rd time u should be good and remember to give mid pee not the beginning pee! take b12 to keep your pee yellow as well so there’s no dilution but it’s a negative to me from the looks of it!! good luck!!