I think the cost of maintaining is shorthand for “liability is too great if we promise that we can care for the springs/fountains”.
There is a spring near to where I live and locals have been using it for over 50 years to acquire drinking water (as many still draw their water from lakes and rivers). The municipality did not cap it after the Walkerton disaster (google Walkerton Municipal Water Disaster) although some thought they ought to. But there is a sign that says “this water is not tested and is not guaranteed to be safe”. Locals still use it. I now run it through UV filters just to be extra careful.
But at a guess, I think nobody where you are noting the issue wants the problem on their conscience and so they’ve opted to close the fountains rather than post warnings.
So: bars/cafes, grocery stores… or: cemeteries, streams and a portable filter UV system. But then you have some extra weight to consider:
Here’s a filter I use on domestic hikes:
https://www.rei.com/product/100537/katadyn-befree-06-l-water-filter-bottle-20-fl-oz
And here is a nice, portable UV bottle:
https://www.amazon.ca/UVBrite-Self-...ess-Steel/dp/B092RGSM7B/?tag=santiagodec0b-20
Used in combination, you’d get pretty good coverage.