I have a question that perhaps someone knowledgeable can address:

Considering that filters are prohibited on Shabbos to obtain drinking water through (apparently for non-drinking purposes it is okay to utilize water filtered on Shabbos), then how can anyone in the United States outside of New York City or the other four cities (Boston and three other smaller towns) that have a federal waiver (due to the natural cleanliness of their municipal water supply) to not filter their water, drink any water coming out of the faucet? Almost every municipality in the U.S. (save NYC and the other 4) filter all their water by the municipality!