I'm not trying to preach but some of my friends are still meth addicts. That will destroy you slowly..I was smart enough to realize it and Stopped using 3 years ago. Just drink plenty of liquids.. The more times you pee the better the chances of you pissing clean.. Normally though meth will exit your system within a week. Don't believe all these people saying your definitely going to fail. I know meth. Trust me drink a lot you'll pass.