Don't waste your money on detox drinks, either use synthetic urine or save your money and just buy some b12 vitamins and creatnine, as that is basically all that is in those detox drinks. Some people will tell you to use niacin, but all that does is flush all water soluble metabolites out of your system. Won't help since the cannabinoid metabolites are stored in your fat. If you don't wanna use synthetic urine then drink a bunch of water before your test until you are pissing clear, then take the b12 and creatnine. The b12 will turn your urine yellow and the creatnine will help bring the specific gravity back to around normal (they tend to reject clear samples and make you test again, and when you dilute your urine the specific gravity changes and so if they test for that they will know something is up and make you retake it unless you take the creatnine and up the SG). If you go the synthetic urine route, I advise against getting the unisex synthetic urine as supposedly it can be detected. Good luck, and remember: before you try any technique, try it using an at home test first, get one of those fancy expensive ones that tests for things such as dilution to make sure you got your method down perfect.