I realize this is a bit of a necropost... but it's an interesting subject and worth considering.
One daemonologist would infuse the magic of a "potion" into living insects and other arthropods, and they would be eaten alive to take effect. And the more powerful the potion, the larger and nastier the insect. Cure Light Wounds might only need a small cokroach or cricket, while Water Walking might need a praying mantis, and the most powerful ones would require a bird-eating spider.
A barbarian tribe might use powders, inks, or herbs instead of potions. Powders are inhaled, inks smeared on the subject like war paint, and herbs could be smoked in a pipe (one or two puffs causes the effect).
