Its always practical to have substances to live off from if there is a environmental calamity such as earthquake, floods, storms etc.
So yes I store nonperishable food items, water, a cooking devise, candles, a first aid kit, backup battery packs for cell phones, a portable generator for home appliances or whatever.
Having some cash stored away too is advisable for if the electricity goes down so does the debit card / credit card buying capability which you may have to have to buy things.
This absolutely has nothing to do with the fear mongering aspects coming from the JWS religion, this is based upon reality of facts and consequences.