Ask for lemon swabs or an oral swab and a cup of water. I know you can't eat or drink anything so that should help. And brushing ur teeth too. Plenty of walking, do a few laps around the halls. Don't be afraid to ask for painkillers after the walks, if morphine makes u dizzy. Good luck to u.
I cheated and started them the day before I was suppose to. Id take a small bite tho. I had a hiatal hernia repair though so it felt like it got stuck and slowly descended into my stomach. It's heavier too, so consider the fact that you'll only need a few spoonfuls.