Can of Tuna. Pretty sure it's cat food.
Tuna is a popular saltwater fish that few people would turn away. It is so popular that it has become a massive sector in the fishing industry, with thousands of tuna raised in fish farms and sold every year. The tuna industry, however, has often been accused of their poor farming practices, resulting in the fish being poisoned with mercury, which bioaccumulates in every organism that consumes it. Nevertheless, tuna still contains the nutrients that a survivor in the Dead Zone needs. Just be sure not to have a cat around while you're eating...