"Hey, Elijah, what's your favorite alcoholic drink? I'm asking because I need to know what to write you getting smashed on before you proposition Dom,"

Hee! At Highlander conventions we just asked, "What's your favorite beer/alcohol so we can bring to conventions in hopes of getting you smashed enough to say silly cute things (and proposition us)."

As far as what Elijah would drink... I think he's a chameleon who would drink whatever his companions were drinking. If he were the first one ordering at a decently trendy Hollywood place, then I think he'd be the type to go for an Apple Cosmo (unless they have ceased being the drink of the moment) because it is fruity and light while still having enough tartness and tang not to be completely girly.