Are you serious? Four types of liquor don't come close to covering the necessities. You need every speed rail liquor, and then liquers on TOP of that. Which liquers is mostly up to you (you need kahlua and creme de cacao obviously), but white rum, dark rum, vodka, rye, tequila, trip sec and gin all need to be present, not to mention non-alcoholics like grenadine, sour mix and bitters. Stocking even a basic bar takes a lot of money, and if you want to do it half-decently, time and effort.