When you ask the kind of questions that were quoted in post #2 , yes - you ARE asking the impossible. And the "other answers" youve gotten from other people most certainly didnt come from THIS forum because I have checked your posting history, fait accompli.

Now with that out of the way, lets address about drinking water.

Drinking a bunch of water in the days or weeks prior to a U/A is of no help. THC is not water soluble. THC is stored in the fat cells and remain there until the fat cells are burned for energy. You cannot rid THC from the fat cells by drinking copius amounts of water. It does not work that way - more on that in a minute.

When fat cells burn, the stored THC metabolites are released back into the bloodstream. From there, the THC metabolites are filtered by the kidneys and are deposited in the bladder for the eventual exit. The rate in which the THC metabolites are filtered from the bloodstream by the kidneys is unaffected by copius water consumption.

Drinking water/other fluids is only helpful on the day of the U/A. Thats because the water/fluid consumption only serves to dilute (thin out) the THC metabolite concentration that is present in the bladder. The idea is to thin out that concentration enough to register below the cutoff thresholds of the drug screen. This dilution phenomena, however, is only temporary - once the fluids ingested had all been urinated out, the bladder is replenished with fresh THCA-laden urine and thus the donor would resume testing positive for THC.

Dilution is a balancing act. Thats because fluid consumption can lower the specific gravity and creatinine levels to where the urine sample can be ruled "too-dilute" when the specimen integrity checks are performed at the labs (which has become SOP in recent years). Therefore, to minimize the chance of such rulings, steps have to be taken to keep the creatinine and S/G within satisfactory ranges when utilizing dilution techniques. These steps are outlined in N2's Dilution "sticky" thread.