every thing tastes bad
It is normal that you would get full after just a few bites. My taste buds were all messed up after surgery as well. Everything was super sweet. So all the different things I had bought to drink, I had to give away. Even water grossed me out. I found that the only thing I could drink and not be disgusted was crystal light. Eventually your taste buds come around and you enjoy things a little more. Hang in there.
This is temporary, just hang in there! Try your water at different temperatures. The only thing I could stand for a couple days was cranberry juice. I did get 'diet' cranberry juice, but seriously for a couple days that is all I could tolerate and it had to be ice cold. After a few days this subsided!