Survival comes in many forms. And one of those forms is sourdough. You wouldn't think that bread would be at the top of a survivor's tool kit, but when you recognize the potential for starters to generate loaf after loaf of bread, it's hard to dispute.
Breads and baking are in some ways a lost art among the general population. But a solid starter can yield loaf after loaf of bread, or flapjacks, or muffins, or batters for other pastries and carb-stock.
And the best part? All it takes is a little bit of flour and water. The simplest of ingredients. And a fair amount of patience. Add a dash of care and you've got the recipe for survival.