Replace the potions with a variety of single use, non-magical, targeted cures/buffs which are made from mostly plants and animal parts, with the occasional rare ingredient for more valuable effects. Include more powerful distillates of existing natural effects.
Cures and buffs should have a single purpose, so that there isn't just one panacea that everyone stocks up on.
Examples:
- Guaji Extract - Guaji Root, Water - Increases movement speed by 10% for 5 Turns
- Antidote - Mintspear, Nuts, Water - Removes common, non-magical poisons (not including player crafted poisons)
- Minotaur Tincture - Horn of a Magical Creature, Spirits, Harnak Seed - Gives 3/- DR vs Physical for 5 Turns