Not this: Bleach Try this: Calcium hypochlorite: granular, stores up to 10 years Not this: Hydrogen peroxide Try this: Iodine or isopropyl alcohol: both last much longer Not this: Protein bars Try this: Pemmican, freeze-dried meals, or MREs Not this: High-acid canned foods Try this: Freeze-dried or home-canned in glass jars Not this: Canola or seed oils Try this: Beef tallow: freeze it, jar it, just don’t contaminate it | Rob Benson