Haymitch foraging in the woods (Theory)

Random thought here, but I was thinking about the fact that Haymitch forages in the woods. On initial thought, it's just a similarity to Katniss. But we're not given any indicator that he knows or has any means to hunt, and he might just find edible food in there. Which would also explain how he knows what a spile is when even Katniss has trouble figuring out at first. Which would reinforce the point that the odds are against him in the arena, since we know everything is poisonous. Like, there's double the kids, he likely has no mentor AND his main survival skill is rendered useless in the arena.