When I was growing up during the cold war days, we used to think about emergency water, too. Not because of earthquakes, but because we lived near a SAC base (anyone heard of Dow Air Force Base?) We concluded that in an emergency, there is 40 gallons of good water in the water heater, and another 6 gallons or so in the back of each toilet (not the bowl, obviously, but the water in the tank is fresh and clear).
Of course, this water is not readily portable, like the water in a TM tank. And if an earthquake knocks either of these off its pins, then you lose it. But earthquake folks should remember that is is there.
Bill
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