One bottle each of:
-good whiskey (bourbon or scotch or both)
-good vodka
-good gin
-good rum (one white, one brown)
-good tequila (anejo or reposado, unless you mainly intend to make margaritas)
-Campari or another amaro
-good dry vermouth
-good sweet vermouth
-cocktail shaker and strainer
-bar spoon
-Rose's lime juice
-good grenadine (not Rose's)
-Mixers
-ice cube tray to make actual cubes of ice, not the sad half moon crescents your freezer makes