This is the WaterBob, a single-use water reservoir that you can stick in your bathtub and fill with 100 gallons of water – and that can keep it fresh for up to four weeks. If you live in a disaster-prone area it could be useful, but there are a few things that one should consider before blowing $30 on a 100-gallon FDA approved plastic water-bag.
Let’s say an earthquake hits, a big earthquake – what happens? Assuming your house is still standing, you probably have no power, and your water company is probably in the same situation, so you have no water. Basically, unless you are prepared to live without a bathtub and want to spend $30 a month on water reservoirs for your bathtub so that you can have it filled up before the earthquake hits… you are going to be out of luck. So for earthquakes it probably isn’t much good.
For hurricane/cyclone prone areas it might be better. Let’s say you see on the news that a Katrina-sized storm front is heading your way. You would have enough forewarning to get it filled up. Assuming that all hell broke loose and your house was on high enough ground that it didn’t need to be evacuated, 100 gallons of clean water could be a life saver.