I use a plain white coffee filer in a funnel when I choose to filter.
You might also keep the film holders in a ziplock antistatic bag or at least ziplock bag when not in the camera or darkroom to maintain them dust free. I do that and don't have to clean them before putting them in the camera.
I have a well too, and use distilled water to make chemistry concentrates (such as developer) or re-usable chemistry. (such as fixer). I don't know what minerals are in it but it works fine for diluting developer, stop, rinsing, etc...
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