Without being an alchemist, but having the alchemical crafting feat, can I add the formula and craft mutagens? If I want a higher level mutagen e.g., a drakeheart mutagen (moderate) lvl3, do I need to buy a new formula (and how much is it?) or is just the craft check increased? Thank you
You can craft mutagens as a non-alchemist.
You need a new formula for each individual level of any given alchemical item.
The cost of a formula depends on the item's level.