there's no more "forage" option during camp, in version 0.2.04.0
that alwas make me die by starvation
Try resting at the inn for food.
if forage disapeard, what's the use of the perk, then?
It didn't - it just happens automatically (with a much greater success spread) when you hit 0 food. That encounter can still eventually game over you, though, but the Forager perk makes that (and the better outcomes) much more likely.