I really dont either, Deguello. We just rinse out our milk jugs really good and store them.
People at HEB (elsewhere, too I am sure) were buying cases of pint size water bottles!
Over here, I really dont sense the need for storing much water - not unless something like a water system failure happens & that is unlikely.
Maybe people fear that the stores will close & they just cant buy their water bottles?
Don't get to a point where you might be like my Grandmother. When we cleaned her house out, we found over a hundred 1 gallon Gandy's buckets.