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Water shut-offs & major plumbing issues aren't that terribly common in the US, but people generally fail to consider that infrastructure failures tend to cluster. People who've experienced e.g. significant natural disasters firsthand have better intuitions about this
it's also pretty easy to buy a decent water filter off Amazon. If you live near a reasonably lively creek that can extend the life of your supply for a pretty long time. Some of them even filter out viruses, though that seems like overkill unless your only source is stagnant.
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