one wk post-op need help.

I feel better when I don't eat and drink and I know how horrible this is for me! I am forcing water and protein/food as I can but only about 1/2 of what I am supposed to. Sugar-free popsicles helping, but not enough liquid. Gag on van flavored whey to put in stuff. most is just too sweet or fruity. My well laid plans are not working. Any suggestions of what tasted the bes****er just lays there, Crystal lite ok but again everything so sweet! Otherwise doing ok