They probably just drank the bottled water after the last scare was over. So, I think it's less of a "preparing for a rainy day" thing, and more a matter of just buying their groceries a bit sooner than they otherwise would, I imagine. On the other hand, if people were rushing out and buying Aquatainers, then I imagine that there's a better than even chance that they'll just keep that stored water around for emergencies since most people won't want to drink that water under normal circumstances if they don't have to.