I also use ISOPURE and it is pretty neutral. I'll put some in jello, but you have to mix it with the cold water, and not the hot before you combine everything. It will mix pretty easily into something cold, so if you don't mind adding a little liquid to soups, you can mix some of the powder in cold water or milk, get it nice and dissolved and then mix it into the hot or heat it all up together, depending on what you are making.
I'm having a similar experience post-surgery with what I think is "fake hunger" and not recognizing what fullness and satiety really feels like. I think some of it is just from the previous eating habits I had. I don't feel hungry, but I also feel like I could or should eat something. For now, I'm just trying to use mind over matter and get used to what satiety and feeling sated is without thinking I need to eat more. It's very different. I'm 5 days post-op.