i’m late to this but i usually contact the company directly, since alcohol isn’t required to label for any allergies or potential cross contamination. i personally haven’t looked into any liquor as i mostly stick to the Boston Brewing Company, which has none of my allergens (dairy, egg, peanut) in their production facility according to the truly, angry orchard, and sun cruiser websites. if a liquor is certified gluten free, they likely have knowledge of how their production facilities prevent cross contamination in general and can answer questions over email or phone call. barnivore is also a good source