My guess is that, with a possible test tomorrow, he certainly doesn't have enough time to burn the fat he needs to burn.

Try substitution - read the substitution thread. Hide it in a place where they won't check you... under your sack is personal enough. Most places aren't going to come in with you for a pre-employment screen. But, they will check the toilet when you're done, so make sure to really pee in there.

If the idea of substitution freaks you out, then you need to read the dilution thread, go to the store ASAP, get the stuff you need, and just go through your interview trying to not do the pee-pee dance. It's a very iffy thing to do at this point, though, since you haven't been taking creatine. But, if you dilute enough, you might actually come up diluted on your test result, and might be able to buy yourself some time to either do it properly, or substitute for the second round.