Next week I go to a pre-op class from 9-2. What should I expect?

Are they going to tell me what "food" to get for after the surgery when I get home. I have been seeing alot on here about a drink you have to drink everyday after surgery. What is it? Where do you get? HELP?? :)

We greatly appreciate your interest in helping us build our Q&A database. To discourage vandals from posting garbage, however, we require people to register before posting.