so i read the bottle and the instructions are not very detailed. last time i smoked was almost two weeks ago. i am getting tested tomorow. i know to take it the day of and give it like two hours to kick in. also i have been drinking a gallon of water a day and taking vitamins the last three days including today. now any tips? the product is 100% gauranteed but do i have to hold my piss till the test or can i piss before my test after i take my drink? any experience with this?