I had a buddy on probation, he had done 3 years for 6 plants. Anyways, he smoked all day, every day. Seriously he smoked probably 5-10 grams a day and had to piss every month. He never changed anything except 24 hours before he had to piss he would start drinking water. He would drink 2 gallons of water in 24 hours and about 4 hours before pissing he would take a B complex vitamin to color up his piss. He never got popped, never, and he was tested every month for 5 years. I suppose all the water flushed everything out long enough to get him through the day. I would have never believed it had I not seen it for myself. The only problem was, it was everything he could do to hold the water down. I was at his house one night while he was on the second gallon and he came close to puking several times. One thing to remember, too much water will fuck up the electrolytes in your system and can cause a heart attack. Make sure you get some electrolytes along with the water if you decide to do that. I honestly don't know if I would recommend it but I thought I would throw it out there for you to consider.