I would suggest going and getting a THC testing kit. I was testing at 33 days without smoking, and although I couldn't pass my first void of the day, I got a faint line after a few cups of coffee (so I was close with a little dilution). I ended up subbing anyhow (thanks QuickFix!).

I got my test kits online for under $2 a piece, but it looks like you don't have a lot of time. They sell them at the head shops (about $10) or at Walmart or Walgreens ($15-$40) but some of the expensive ones test for more than THC.

If you can test negative on your first void of the day, you should be fine. If not, read the dilution or substitution threads.

If I remember correctly, you are not supposed to exercise much in the last days before the test... you are supposed to be lazy and eat fatty foods (just in case you still have THC to be released from the fat you already have!)

I don't think alcohol is affecting this particular dilemma, but I don't drink, so I'll let someone else comment if its relevant.

Good luck!