Good luck to you. I think you've been given great suggestions.
I am pre-op and on Clear liquids. Having surgery 12/19. So every Christmas party for me will be filled with Protein shakes.
Haven't read all the other posts yet but wanted to add mine.
I received my date Friday- dec 19th.
I'm 5'4" was 321 before required weight loss. Friday morning I was 296.6 before starting liquids. I am on Clear Liquids till surgery.