Surgery
I can't add to anything that's already been mentioned, but wishing you a very safe surgery and looking forward to reading about your post surgery recovery. Walk, sip, rest over and over again. For fluids during clear liquid phase I drank the IsoPure Zero Carb drink in Apple Melon and Grape. I got mine at GNC. Good stuff and lots of protein. I couldn't drink cold fluids so drank at room temperature. You'll do great. Stay positive.