You will LOVE Dr. Alvarez and his staff! They are top-notch. I have not had a single problem in the almost four years since Dr. A sleeved me.
Take some chapstick and some mouthwash or mouth-moisturizing spray or rinse. Your mouth will be dry as the Sahara before he lets you have even ice chips. You can, however, rinse your mouth and spit and slather on some chapstick and it really helps!
Other than that, the only thing I was glad I took was a lot of those individual packets of Crystal Light to mix in my water bottle while I was in the hotel post-op.
The best advice I can give you for post-op, though, is to walk walk walk just as soon as you can -- up and down the hall at the hospital and then at the hotel, every half hour or so; and sip sip sip constantly! Those two things, I'm convinced, made my recovery a breeze. Best wishes on your journey :-)