Wow, this is the first post I've ever seen that actually reflects my experience.
14 years ago RYGB was major surgery requiring an open procedure and 2 or 3 days in the hospital.
What i remember was the usual grogginess and desperately wanting a drink of water. I had daily meds and I had one unpleasant nurse who crushed my pills into grape jello and basically shoved it into my mouth.
I don't know why, but they fed me. I wasn't allowed to feed myself. Then they did the usual stuff, getting me up to walk the halls and helping me get stronger every day.
Then I went home and stayed mostly in bed. I had a 7" vertical incision, so I had pain and it took a long time to heal.
There's one important thing I tell everyone. For at least a week before surgery, used a fiber laxative daily and drink a ton of water. I didn't and had an epic bout with constipation. Do whatever you can to make it easy to pass food through your digestive system.
I didn't have a "before" diet. I was advised to eat specific foods after, and mostly cereal, mashed potatoes and soup. These were made using Magic Milk, not water. Search the group for posts about that. Gradually proteins were introduced in puree form. I actually put cooked turkey in a blender with a tablespoon of Magic Milk, gravy mix and cranberry sauce. Delicious!
I enjoyed the post-op diet, and slowly added soft foods and lots of water. I lost 60 pounds in the first two months.