Protein shakes are disgusting. I preferred soups - cream, consommés, bone broths. Strain them very well to make sure there’s no herbs or small pieces of meat or vegetable in them. Warm drinks seemed to be more soothing & easier to drink. (I used to heat my chocolate shake.).
It’s not uncommon for your taste buds to temporarily change or for you to become more sensitive to smells - it does pass but can make some foods taste or smell disgusting. I only bought vanilla & chocolate shakes as I thought they’d be more pleasant to drink if my taste changed. I also bought my soups, bone broths, etc. too.
Buy some disposal underwear for that first week post surgery. Some us experience ‘dramatic’ diarrhoea after surgery which can be embarrassing (can literally just run out of you).
Make sure you have all your over the counter meds ready at home too (pain relief, gasX, non swelling fibre supplement, Imodium, stool softener or similar, electrolyte drinks or powders, etc.).
Don't be surprised if you spend a lot of time on your couch after surgery. Your energy levels will be very low.
Invest in small containers for meal storage, good measuring cups, a fine strainer, kitchen scales. I used teaspoons & sporks to eat & served my food on side plates & in small bowls (tapas size). I also found it easier to sip through straws to begin. Don’t be surprised if your fridge & freezer are filled with your left overs.
Good luck with your surgery.