Potions come in small corked vials, often etched or color-coded for easy identification. Each fits neatly into a belt pouch or bandolier slot. Treat them as minor items for encumbrance purposes - light, but fragile. Breaking a potion in a fall or fire can be a fun narrative twist (use Probability Roll).
Drinking a potion takes one round. Its magic takes hold immediately and lasts for the duration listed in the potion; a potion with no stated duration resolves at once. A potion is spent the moment it is drunk, whether or not its full effect was needed.