I forgot to mention, potions here are a bit more flexible than they would be in a game of D&D. You can ingest it or rub it into something to apply the effects on an item as per usual, but they can also function like grenade weapons. Like if you threw a salve of slipperiness onto the ground, it would function like the grease spell.  Or if you threw a potion of Inflict Wounds onto a cliff side covered with vines, they would snap and send anybody or anything climbing on them hurtling towards the ground. Contact with the solution is enough to transfuse the magic into it.