07:50More or LessShould we really be drinking eight glasses of water a day?BBC World Service Duration: 9 minutes Mon 9th Jan 2017, 07:50 on BBC World Service East and Southern AfricaAvailable for over a yearListen nowHow much water do we need to drink each day and can too much kill you? Show more GenresFactualFormatsMagazines & ReviewsBrandMore or Less Source: BBC Online