Drinking days before the test will not clean you out faster. The dilution method's goal is to dilute your THC metabolite concentration below the cutoff on the day of test, not to pressure wash your insides. Make yourself more comfortable and slow down on the fluid intake till the day of the test. Then Saturday or Sunday morning test with your first void of the day. Most people who are overweight take longer to clear THC from their system than skinny to normal weight people.