Hi Lou. Sorry you are having problems with your vitamins and eating in general. I do wonder about the vitamins. My dr was very adamant about me not using gummy vitamins. She said that they may not dissolve/break up as well and could get caught in the suture line causing pain. Have you tried just the Flintstone chewables? I wonder if that small change may help your stomach overall and allow you to get some pureed food into your system. Have you talked to your dr about this? Make sure your team is kept up on any occurrences like this because no two people are the same and your reactions to vitamins and food may be completely different than mine or anyone else's here.
As for the infused waters, I tried a couple the first week after surgery and they tasted too sweet for my liking. At this point, I might enjoy them but I haven't tried them again since. I don't know if you are looking into it because you are trying to find a way to hit your daily water goal, but if so, try altering the temp of the water as well. If you are having problems with cold, try room temp or warm. That could help too!
Good luck!