Years back I invested in a small home distiller for around $200. No filters to replace. I run my drinking water through it and get very clean water. It's slow and takes 5 or 6 hours to make a gallon.

The tap water in the city reservoir is pretty good but it must flow through so many pipes and picks up rust etc. If you live in an older building you can get contaminated by lead unless you distill it.

Plastic bottles are nasty it seems. Tap water is risky. Distilling is the best of both worlds.