The best advice I can give this late in the game is to get over 8 hours sleep the night before the night of the race and to carbo load the day before the day of the race. You will be anxious the night before and will probably have to rise early for the race, so you'll need those zzz's in the bank. Also, you don't want to be so bogged down with heaviness come race day - carbo loading the day before is a myth. If you do it the day before the day before and eat wisely (often and with both carbs/protein) the day before, you will be set.
I always eat a Cliff bar and a banana, as well as drink a small Gatorade and a small water long before the race on race day. I have to stand in the potty line a few times, but I am also a heavy/salty sweater, too. I then make sure I consume a gel right away on the bike, as well as about 15 min before the run. I down an entire Gatorade again on the bike, as you won't feel like drinking much on the run and you'll need to be fully hydrated. If you do another one, you should practice a couple of bricks (bike/run combos) to get your nutrition down. Best of luck and be sure to let us know how it goes!!!
~Angie