bringing some booze for very small halloween party, recommendations?

not much of a party more like me and three other people watching scary movies and eating candy. i was originally just gonna bring vodka so we could just mix it with stuff (broke college students) but i think maybe ill bring one bottle of vodka and one of something else for funzies. but what should be the other thing?

no beer pls. needs to be something you could buy at a typical grocery store and under/around 20 dollars.