Practice fishing and vomiting.
True story.
From my early characters, little understanding of the game and before the mighty BAC mod or even Brygun's added items.
A low food supply character got injured badly. So I made a shelter on the shore right next to lake. Fire starting was a skill then and he sucked at it, being a new character. His fishing skills sucked too.
So his routine was desperately spending hours for fishing with no to little yield. When he did catch a fish try to start a fire to cook it. Often give up eat it raw.
A little while later vomit and eat more fish if you have it and if not go back to fishing.
I envision the vomiting being done into the lake as "chum" bait to attract more fish.
>>>>
On a more serious note hand crafts are a thing. You can likely manage up some bone tipped arrows for trading. A hare will net enough bones for 4 bone tips and the odd bird catch will be enough feathers.
Other wounded characters have done better by going to heal up in towns. They have a water in town... unless its winter and you can;t find it. You can sleep for free at a heated indoors. Plus if the village has a shaman they can give you healing bonuses.
So around a village the usual cheap labor jobs. Crafting boards which gets filled up. Making paw-boards. Making torches. Making bowls. The "we have enough" is per item so switch up what you make. A few goods will buy you even food they sell to feed yourself while healing.