How long does meth stay in the system?

dependng on how much your using, crystal methanphetamine can stay in your system up to 7 days. (if your using everyday) drink lots of water and i mean lots. make sure your urinating frequently. seriously make sure you are drinking any kind of detoxing fruit juices like pure cranberry juice too, but dont stop drinking water 40-50 oz the day before the day of test at least. 3-5 days of sobriety between tests 7 days or more maximum. I also read online that if you put 2 tablespoons of baking soda in water and drink it all while still drinking 40-50 oz of water make sure you urinate before you go and do your test. The next pee you do should be clean.( if you do it correctly.) **This is only for urine testing. could also work for blood testing and saliva, but dont quote me on it.