Yeah, near the west gate I got one. Seeing how the item NEXT to the campfire is also called 'mobile kitchen', which cannot even be interacted with, I'm not sure we're supposed to haul it around in the inventory in the first place.

But that's a question for Larian.
I decide just to do it with one cooking pot (since it reduced value by 6). Cooking fish increases weight from 0.2 to 0.4 (dinner), so decided not to do so until I need the healing.
But... since I can use healing spells after combat, there's not that much need. Can be nice in-combat I presume...