I am on a committee at work (medium sized midwest hospital) for emergency preparedness. The potential for a flu pandemic has caused us to stockpile oxygen delivery supplies, IV fluids, etc and have plans for deciding ethical issues like "who gets the last ventilator?" The public education slogan is "Stock up and stay home." The federal government has funded huge plans for mass medicating and distribution, as part of the Homeland Security plans.
So actually, religious groups are encouraged to have their members prepare for a minimum 3 day crisis (storms, etc) and a 3 month quarantine (flu epidemic, war, etc).
See www.pandemicflu.gov
Of course, you won't find reference to armaggedon or tribulation.
My elderly parents have paid attention to my urgings to stockpile non-perishables 'just in case'. Of course, here on the fringe of tornado alley and having lived through the depression, they are fine with that. Actually comes in handy--Dad's got tons of toilet paper and canned soup!