The number one problem during disasters is the lack of potable water when the power is no longer available to run the city pumps. The downside to filling a tub is that the water is open to air and contamination. Great for flushing toilets, but keep in mind a person needs at least a gallon per day per person.
Perhaps I'm being a bit paranoid, but having an extra 100 gallons of potable water before the city water goes away is priceless. My only bitch is that this is a single use system.
http://www.waterbob.com/Information.do?forward=preparedness
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