I am not sure if this was specifically suggested before, but I'd like to see smoking of meats, salting, pickling and other old school practices of preserving foods, especially meats to be looked into. The tradeoff for this is that in order to preserve said meats and foods you have to be a fairly adept cook, perhaps level 3 or even higher, and have the materials to do it. (Like salt.) There can also be a reduction on the nutrition value of the food, so its a trade between a long term supply or an immediate nutritious meal.