I'm just over 65 years on the central Gulf coast of Florida, and have lost city water only once (back in the 60s) due to hurricanes... quite a bit of power outage over the years, but the city water has been pretty stable... that being said, I store about 20gal in a couple of 20L Scepter cans and a couple of older AquaTainers (2ml of bleach added for storage, and rotated out at the beginning of hurricane watch) additionally I have an older model Sawyer .1 micron 5 gal bucket filter... I purchased some low scale (single digit ppm) chlorine test strips, and titrated out some of the new formula pool shock per 5 gal bucket just in case