In general, food bottles have not inspired as much interest from collectors (the source of a large majority of bottle reference books) as other categories.
Thus, foods have received a relatively limited amount of research in comparison to the relative commonness of the type.
The one significant exception to this statement would be the fruit/canning jar category which has generated significant interest (and references) from collectors (Munsey 1970).
Historically, many processes were used to preserve food for the long term including drying, smoking, pickling (like for the cucumber pickles that likely were contained in the ornate bottle to the left), sugaring, salting, alcohol (i.e.
The organization used here simply made more sense given the author's experience and the specific goals of this website.