"good water is on tap"

Still curious to know what volumes of plain unflavoured tap water other people here drink?

Tam (who filters) has said she drinks 2 litres of plain unflavoured tap water a day (sometimes as ice). I probably have something like three pints of unflavoured spring water a day (on top of tea and coffee and herbal tea and juice.)

How much totally plain tap water, do the fans of tap water drink a day?