Good luck on your surgery! Im like you, i had a hard time finding something I liked. Here is what I did because its better to get the Protein in you then dislike everything.
I made mine in a smoothie form: strawberry advantage edge, about 5 frozen strawberries, 1/2 strwbry yoplait light yogurt, greek yogurt, 1 cup of ice. Blended it all & ate/drank on it for several hours.
After doing this for a few weeks I Removed the yoplait light yogurt but kept the other ingriedients & actually liked it. But i had to work my way into removing the yogurt. Maybe try it & see if you like it. You can do all flavors & easy to get at Walmart.