Hi Mshell! Welcome to TT! Good luck on your journey
I would highly suggest you send away for some samples to try before buying a ton of protein..
Vitalady.com - Protein Supplements, Vitamins & Minerals, and Safe Snacks! sells samples of some of the popular syntrax protein drinks.
Just know that your tastes frequently change after your surgery for some reason, so don't stock up too much beforehand.
If you want to add protein to a hot drink or food, you can try Any Whey from optimum nutrition.. (I buy it at amazon.. cheaper that way) As far as I know, it is the only one that is heat stable, though there may be others out there.. most are not for use at temps higher than 120/130 or so..