pf2e.fyi
From Pathfinder Howl of the Wild, which isn't enabled.

Tubeworm Gland

ITEM 7
Price 330 gp
Usage implanted
Bulk —

Thanks to a graft from a hardy deep-sea invertebrate in your stomach, you can ingest food and water that would be toxic to others. You gain a +2 item bonus to Fortitude saving throws against ingested diseases and poisons.

Pathfinder Howl of the WildORC