@Dutchess__III The broth will give you some salt. Sugary drinks, and things like jello, will give you calories. Both are important. If you drink something like apple juice (if it’s allowed) you get some potassium too. Don’t have any of the things to excess, I’m not suggesting you drink a liter of juice and ginger ale, I’m just saying be cognizant of what liquids have what, and try to strike a balance to avoid feeling hungry, light headed, or nauseas.
If you regularly have caffeine, make sure you have some. If it’s usually coffee, and they don’t allow coffee for some reason then maybe you can have a Mountain Dew. Caffeine withdrawal will likely make you feel like crap by around 3:00 if you typically drink it in the morning.
The trick is to keep your electrolytes balanced, and enough calories for the energy you need during the day. I’d take a couple of multivitamins and an iron pill the night before, but I’m deficient in all sorts of things. Certainly for one day of fasting you don’t need to obsess about vitamins and minerals. Not that you were.
You’ll be a little stressed most likely anticipating the surgery. That will likely decrease your appetite.