First up: Bourbon. Yes, bourbon—the peanut-butter-and-jelly of brown spirits. Its vanilla and caramel notes hug the eggnog’s creamy body like an old friend, while the heat keeps things from getting goopy. I once tried a cheap bourbon blend, and it made the nog taste like a wet campfire blanket; stick with something like Buffalo Trace or Evan Williams Bottled-in-Bond. Pro tip: add a splash of high-proof bourbon if you want to feel the jingle in your bells.
Then there’s Rum, the traditional choice, but not all rums are created equal. A gold or aged rum—like Mount Gay Eclipse or Appleton Estate—brings molasses and baking spice that dances with the nutmeg. Skip the white rum, because that’s basically flavored water, and you’ll end up with sadness. One friend of mine insisted on spiced rum, and it turned the nog into a clove bomb—fine if you’re making puns about “spiking” the bowl, but not for everyone.