Novus (Left) is totally a caffeine gremlin. Or at least the closest thing in the setting, which is a chewing herb with similar properties. The only drink made from it involves turning it into a dust and mixing it up with a bird egg white. You cook the whole thing in water and the mix of egg white and herbs raises and forms a film over the liquid. You leave it jellify and get cool, you cut the upper layer and cube the rest. Each of this gelatin-esque cubes is dissolved in water and re-heated to drink.
Callis (Right) has a very sensitive tongue and avoids hot and flavorful beverages. He is in favor of cold milk infusions, usually common place in fall and spring, using the snow from the early and late snowfalls to cool it. Most herbs used by him are really soft in flavor and lack any spice or sweetness. Is more like a health drink than something to enjoy.