> How do Coca-Cola get around having to list all ingredients when they sell a bottled product? They just list 'flavourings' don't they
Per the FDA[1], "some ingredients can be listed collectively as "flavors," "spices," "artificial flavoring," or in the case of color additives exempt from certification, "artificial colors", without naming each one. Declaration of an allergenic ingredient in a collective or single color, flavor, or spice could be accomplished by simply naming the allergenic ingredient in the ingredient list."
> what if you're allergic to one of the anonymous ingredients? Are they just not allergens?
Basically the only regulated allergens in the US are[2] milk, eggs, fish, Crustacean shellfish, tree nuts, peanuts, wheat, and soybeans
[1] https://www.fda.gov/food/food-ingredients-packaging/overview...
[2] https://www.fda.gov/food/food-allergensgluten-free-guidance-...