How much water do I have to drink to clean out my system?

okay. I got out of juvy on the 18th and I've smoked weed 3 times since I've been out I have a ua on october 4th how much water or gatorade do I hvae to drink to completly clean out my system before my next ua

dude just drink gallons...my feiands just carry around milk cartons with water...and drink till the puke...with any luck you can do it in 2 days...and I mean GALONS!!!

drink a lot of water but (its unlikely) there is such a thing as water posioning. becareful. I would go to GNC and buy a flusher read the instructions and should be taken that same day. also walgreens sells at home drug screening so if you insecure about it buy a home kit and test yourself. if your positive, than get the flusher. im not sure your age but you have to be 18 to purchase at least in Illinois...