Water- One of the biggest concerns with beans is that it uses a lot of water. You need water to soak and then water to cook them in. If water is scarce this could be a major problem.
Indigestion- Beans are known for there ability to give you bloating and gas. The best way to avoid this is to use fresh water after soaking. However, given the previous statement, you may have weigh which is worse.
Fermentation- Beans can ferment, especially during the soaking phase. To avoid this, beans should not soak in warm weather. This could be a problem should you not have electricity in a hotter climate. If you have a electricity, soak them in the fridge.
Cooking Source- Almost all beans need to be cooked in order to be digested properly. If you are going to store beans, make sure to have a source to cook them.
Dried Beans- For long term storage, it must be dried beans, not the precooked beans found in cans at the store.
