By non-surgary, do you really mean no sugar or do you mean liquids other than sweet foods/drinks?
I know when I have to prep for a scope the most difficult issue is that most all "clear liquids" are sweet. I get nauseous enough from the prep, the last thing I need is sweet to make me even more nauseous!!!!
I rely on bouillion and tea. It turns out I usually can tolerate a popsicle on occasion during the prep but that is pretty much the extent of sweet during the prep.