Making your own bitters is a labor of love, so use the highest-quality ingredients you can, such as unwaxed organic citrus and top-shelf vodka. Gentian can be found online or at some health-food stores.
Glogg is essentially a warmed punch made with an infused distilled spirit such as vodka or aquavit as well as fortified wine -- that is, wine that's had extra alcohol added. The infusion needs to steep for a week, so factor that into any party plans.
This cinnamon-vanilla rice drink is a frothy Mexican classic. Rice flour offers a nice shortcut, eliminating the customary need to soak grains of rice overnight and grind them. Condensed milk gives the blend sweetness. For a spiked version, stir in a little rum.