You can beat this fella, keep the fluids going but don't give them a clear diluted sample they probably wont take it. A multi-vitamin and some b-12's will help add some color to the sample. Doesn't sound like your a chronic everyday user so I think you'll be fine. Aside of that try not to sweat it so much, that won't help ya pass. I'm taking one this week too for a job I've waited a long time for. But Im polluted with chronic use. Im gonna pass it anyway (with an additive).
You'll pass...........Good luck``