I assume you are getting a "tummy tuck"?? When you first get out of surgery, you won't be able to walk much & should rest as much as possible. You most likely will not be able to do much for the 1st 7 days & may have to walk bent over & sleep in a recliner. The first week is tough!! Eat whatever you want & whenever for the first week & then for the 2nd week cut back a tiny bit. For the first week after surgery your body will need extra calories to heal plus you will want to eat easy to prepare foods, cuz you won't be able to cook much.
Get puddings, mac N cheese, microwaveable meals (salt is unimportant at this point), soups, crackers, water, Gatorade, etc. Make sure you eat enough to be able to take your meds. Vicodan & Percoset can make you sick to your stomach. You may not think you need the meds, but you'll probably hurt more than you think you will. Watch moving around too much too & wear your garment!!!!!!!! You don't want to pull out your stitches.
Also, have whoever is taking you home to bring lifesavers. Coming out of anesthesia can give you the worst dry mouth ever!!!! It's awful & no amount of ginger ale will fix it. Also drink LOTS of Gatorade cuz it helps prevent blood clots, which you don't want to get.
Any other questions, ask.