Chain places are the most likely ones to card you. Don't get scared of being carded, its not like there's any punishment for trying and failing. Just go to as many places as it takes. Local grocery stores, gas stations, local pharmacies, dollar stores, places with young people for cashiers. Just remember, no one cares, and them asking for id is fine, all it means is they aren't going to let you buy it until you show proof of being 18. Doesn't mean you can get in any trouble, they won't call your parents, won't alert anyone (unless maybe you were trying like buy like 30 bottles) honestly no one cares except you. They just don't want to get in trouble by going against store policy.