If you posess a skinning knife, wild game such as deer and boar can yield meat as well. After you've killed an animal, look to see if it has a 'skinnable corpse' and then equip your skinning knife to skin the corpse. Once you have some meat you'll need flint (good for 20 uses) and tinder (1 use each) to build a campfire over whch to cook your meat.
Heh! START FISHING! It's Cheap, easy, AND its FREE FOOD!