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.
Well, in some European countries you could load your car while at work or grocery shopping.
Depending in your commute this could just be enough.
Anyhow: the prices and (country-specific) loading network might be show stopper. Many other things are just habit and/or subjective convenience.