ok... here we go...
drinking water all week isn't going to do squat 'cause THC isn't water soluable... therefore save the water for right before the test to dilute what IS in your urin.
i don't know what everyone's fixation with cranberry juice is... it's good for your urinary tract and cleans that out... but i fail to see how it removes THC from your urin.
exercise speeds up metobalism which in-turn burns off fat at a higher rate. this will help you become clean quicker.
DON'T FAST!!! if you cut off your food supply or drastically reduce your fat intake, your body's just going to keep what it already has for longer... so you'll just end up making things worse.
GNC has detox kits which include shampoo and pills (the pills speed up your metabolism so don't take too many at once... just what it says in the kits instructions), but it takes a week to be completely clean... so if you did this, worked out a little, and drank a lot of water (the day of the test) you should be fine.
b-vitamines also speed up your metabolism... so you might wanna pick up some niacin pills or something... just to help out a little. only take like 1 when ya wake up, 1 in the afternoon, and 1 before bed or something like that... depends really on the mg you get.
if you want fool-proof go to hightimes.com... follow any associated links that have to do with urin in a pouch. they usually come with temp controls to keep the urin in the proper range... they're a bit costly, but a good investment. you usually get enough for 2 tests, too... so it averages out to like 30-40 $$ for each test, which is about the same as the detox drinks at GNC.
sorry for it being so long... hope this helps