I would think the easiest way to store protein is to buy cans of high quality whey protein isolate or egg protein. 25 grams of protein per serving is close to half the daily requirement for adults. And while you're at it pick up some fish oil supplements, superfood/wheatgrass powder, chia seeds, flax seeds, multivitamins, etc. We're lucky high quality supplements are cheap enough to stock up on. That might not always be the case.