Rules for brewing potions and Craft(Alchemy) while away from civilization?

[Ajax, The Warrior]

Spoilers for the Serpents Skull Adventure Path ahead, you've been warned....

So I was trying to run the Serpents Skull adventure path and one of my players wanted to be an Alchemist. I thought that sounded great until when looking for how he would make potions and whatnot all I could find were monetary values for ingredients and such. This would work just fine if there was a town or city, but how is a player expected to buy ingredients while stranded on a tropical island? They never mention it in any of the books as far as I can tell. Does anyone know if there is a ruling on this situation, or maybe your group has come up with a good fix? Any help would be greatly appreciated.

[Daanu]

The alchemist's extracts will function as long as he has his kit and a source of fire, so at least those should not be a big problem.

Actually brewing potions using brew potion can be a bit tricky, but the same can be said for scribing scrolls or any other craft check involving a gold cost.

You can ofcourse let them scavenge the wilderness or shipwrecks for certain requirements. (maybe balance out the costs somewhere else)

an other solution is to let him use his starting gold to preempetively buy some crafting materials.

There is also a chance it will not be a problem at all considering extracts will get you through the first levels without any real problems. (At least to the point where you get off the Island)

in the later parts the PC's should have a caravan able to provide most of the materials at market price

Hope this helps a bit.

Have fun with Serpent skull it's quite a good AP but it does need some work.