I always make sure that the vinegar I use in food is fermented from apples (can be from corn, check if allergic to corn) and not from petroleum. I get cheap white vinegar for cleaning, I think that it is a reasonable alternative to even stronger petroleum products. And it's very cheap too.
Lots in my family have some severe allergies, so we are used to checking for those allergens in processed foods, and even then they might no be on the label.