SOG made their shovel practical survival gear by cutting back its length to a manageable 18 ¼” and its weight to an equally manageable 24 ½ ounces. It folds up to a mere 1 foot long and can be easily strapped to the exterior of any decent sized backpack. The SOG shovel also boasts a row of thick rugged teeth along the side for hacking and cutting underbrush or harvesting wood for your fire. The blade can also be rotated and used as a pick or a hoe to do more precise clearing. All in all this is a piece of survival gear you won’t want to do without.
Based on this crude but honest assessment of the general public's affinity for the common bicarbonate, you'd be surprised by how much survivalists are into it (#2 on the list of "things for preppers to hoard"). They must expect some pretty serious hankerings for tasty leavened baked goods, or they have extensive phobias about the funkiness of their nuke survival backup plans.
To me, the best option is to store emergency food. How much? If you have none, store enough for a few days. If you have enough for a few days, get enough for a week. How much you store depends on what time frame you think you're at risk for having to be completely independent. The early settlers of the southwest liked to store enough food for a whole year and still do to this day!