There is a great book that just came out called Passing Drug Tests. It explains what you're going through. You are going to talk to a Medical Review Officer (MRO) and he's kinda like a referee. He will give you a chance to explain why you might've come up hot. Quest uses GC-MS, not immunoassay, drug tests so it didn't matter how much water you drank and you have to come up with a very good reason why you're hot.