yeah drink a ton of water.... it is almost impossible to drink too much water, you basically need to have popped a shitload of E, or trained to drink water by stretching your stomach. if you drink 3 gallons a day, and run alot and are really active, you can have your whole blood stream cleared of thc in under a week, and it normally takes two
they sometimes do hair tests though which you cant pass unless you cleanse your whole body and then wax every bit of hair off.