Rob Benson on Instagram: "Prepper Items That Do Not Last as Long as You Think and What to Store Instead Liquid bleach has about a one year shelf life and slowly breaks down into salt and water. A better option is calcium hypochlorite which stores dry for years and lets you make fresh bleach when needed. Liquid antibiotics degrade quickly once mixed. Solid tablet antibiotics stored dry last far longer and remain reliable. Vegetable oils like canola soy and corn oxidize and go rancid within one to