Drinking lots of water days before the test WILL NOT increase your kidneys ability to filter THC from the blood. Exercise can help increase THC elimination but you are too close to the test for that to work. Or is it next Friday the 10th? Exercise up until 4-5 days before the test or else the extra THC eliminated by your body will end up in the specimen cup. Eating soluble fiber can help a little. Not insoluble but soluble. Try to get some Metamucil. Take about 12 grams of soluble fiber a day.