Good luck! My team allowed 2 PRE-OP options. You had to choose from 2 medical grade protein powders. One was just shakes and zero calorie fluids and the other came with a specific list of foods and their serving sizes you could eat up to 6 servings a day. I chose option 2 just so I could chew something although it's not much.
Do liquids include sugar free jello, sf popsicles, broth, etc? If so, at least you'll feel like you're "eating." Walmart & Kroger's carry a variety of 4 packs of different brands of protein shakes. Premier Protein has caramel, strawberries & cream, and cake batter which I like. Pure Protein peanut butter chocolate is like a liquid Reese cup. Fairlife has chocolate protein shake that tastes like chocolate milk to me. Good luck with your upcoming surgery. It'll be here before you know it, and soon you'll be on the other side with the rest of us "losers" LOL