No - you are wasting your time drinking the water. The only way that MAY work is to dilute your urine sample on the day. THC is not soluble in water...drinking alot won't make any difference.
There are plenty of guides on this forum on how to dilute your sample but even that is no sure way to pass as they will know you have done that unless you take the right precautions. Fat burning exercise is the best way to accelerate the bodies natural detox process. Failing that get some Quick Fix 4.