Chewing gum is generally recommended with this kind of food.

There are already known problems with this kind of food, and I wonder why no one seems to address them. First, the lack of probiotics. Second, some metabolic pathways cannot be done at the same time (sorry, I don't remember the specific examples), so if you eat both X and Y in the same food, X will take priority and get digested, but Y will be ignored. This is not a problem if some of your food contains only X and other contains only Y, but may become a problem when X and Y always come mixed together.

The second problem seems relatively easy to fix: just split the food into two (or more if necessary) variants. For example, make one variant with double X, zero Y, and the usual amount of everything else, and other variant with no X, double Y, and the usual amount of everything else. Not sure what to do about the first problem; I suspect probiotics do not have the same shell life as the usual Soylent ingredients.