If I'm not mistaken he's talking about India. It's common advice (for travellers at least) to only drink bottled water in India.
These days its so sad to find every shop ordering a container of filtered drinking water. Earlier it was available through taps. Now no one trusts tap water.
Most urban households have some kind of filtration system in place. The water supply infra is quite bad, with frequent contamination due to leakage.