I live in the restive province of Narathiwat in the Malay Muslim deep south region, next to the Malaysian border.
Some 7/11s sell alcoholic beverages, but certainly not all. Even in the main residential areas, if a convenience store is owned and operated by Muslims, which most are, there will not be alcohol, or pork for that matter, on the shelves. No matter the location (near schools etc.) of the branch.
It never bothers me as I don't drink alcohol myself, and pork can be bought at Buddhist-owned establishments, but it may be something to keep in mind.