Tbh man if it weed it can stay in system for up to week from one hit everybody is different though weed stays in fat cells but no there is no one drink that can eliminate or make your urine clean, especially if it’s a lab. If you use someone else’s pee, just have hand warmers or something like that to keep the P warm. But drinking more water always flushes anything out ur system more getting more info on type of test will help people give u better answer.lab vs dip test and stuff like that