In addition to suggested resources below, you may also want to view our "Cocktail History in America" LibGuide. On the "General Histories & Specific Topics" page, there is also a small section on "Bitters & Patent Medicines." Our resource guide for introductory Appalachian Studies courses also contains a section on food: Food & Foodways (incl. traditional medicine, farming, & agriculture). In addition, the library's catalog can help you locate additional patent medicine-sponsored almanacs or cookbooks (we have included only a few examples below).
From Knox Gelatine: Desserts, Salads, Candies and Frozen Dishes, c.1936