Jim:
Seeing the following got me thinking: “JWR’s Comments/Recommendations: Mr. Sierra is typical of most suburban survivalists in that he is tied to a Big City job. I recommend that he store at least 100 gallons of water”
Have you mentioned the need for people to flush their hot water heaters twice a year? This minimizes the mineral buildup and provides a fine source of drinkable water.
Putting some chlorine in the toilet tanks does the same thing. This kills bacteria and upon cleaning twice a year, provides more drinkable water.
I have seen systems where people have strung together 55 gallon barrels with removable lids. Their household water from the street runs through these drums. One valve between the drums and the street will prevent contamination if the city/county water supply gets contaminated. – Dave