Welcome to the forums.
Hopefully, you've learned what your post-op program looks like and how it works. Depending on the requirements it will make sense to have at least a few options available for the first week. Your tastes may change a bit for a while, so variety may help find something you like.
Have a comfortable chair/recliner, or minimally pillows that can prop you up. Sitting up was often more comfortable than laying down.
During your 3 day liquids, protein drinks, broths, soups (only liquid part), are anything comparable. I was never on a liquid diet preop or post-op, but when I do such I go for big flavor.
Good luck.
Tek