I'm sure they're out by now in your area, but 5 gallon jugs (office cooler style) are at Home Depot/Lowes under normal circumstances. or install an undersink Reverse Osmosis system with a UV filter.
Sorry for the late reply.
I feel your question is a quiet country and living situation specific.
Here in Germany the guideline says to store 2 Liters (0,53 Gallons) per person per day and to have a stock of 10 days.
Having this said, our country is smaller, ways are shorter.. supply chains easier to establish.
You could talke your problem by a ) have some canned water stored as the guidelines say, b ) get informed about water sanitation with filters and chemicals and prep these items.
Without owning some property, having enough storing room and for example a well, you won't be able to be really independent.
So my best advice is you prepare to bridge the time until supply is up again (may it be logistics or pipe), or until you can move to a different unaffected location.
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