He is totally stupid and that is a totally stupid statement. At home you drink from a fresh water tank all the time, your city water supply is a fresh water tank. You can drain and sanitize your TT fresh water tank but the city can't. Bottled water is no more pure and in most cases less pure than your fresh water tank unless you put contaminated water in it. I sanitize my tank once a year, probably unnecessary, and we use it for everything, including drinking and have for many years. I do insure that I fill it with only water from an approved municipal source.