Good to know, thanks for the rundown!Pretty easily as a Rogue with some Skill Tricks Everytime we encounter a creature with a poison attack, I use the poisoner's kit to harvest poison from it (usually autosucceed since I have d10 expertise and Resident Expert from Human which means I roll a 10 at the d20 mininum). Then I use Analysis to determine the recipe for the poison in 10 minutes, then Unstable Poison to brew one dose for free (but can't have more than one). Then use the poison on three pieces of ammunition as per the rules. I use the "real" poison only in emergencies, but with PB uses of Blackblade from subclass I rarely run out.
Also: Just scavenging with the poisoner's kit has a good chance of netting you free poison.