بسم الله الرحمن الرحيم
According to Islam wine/liquor is haram and unlawful. It is haram and unlawful for a Muslim to sell or buy wine/liquor though the customer or seller is Muslim or non-Muslim. You cannot keep liquor in your store. You must sell only lawful things, though it fetches less benefit for you or your customers decrease, in-shaAllah, it shall carry lots of blessings. Haram wealth, in any case, is a malice though it is more. May your business prosper! Amen! Allah says in the Holy Quran:
Say, “The evil and the good are not equal, even though the abundance of (what is) evil may attract you. So, fear Allah, O people of understanding, so that you may be successful.”
Allah knows Best!
Darul Uloom Deoband