20:50More or LessShould we really be drinking eight glasses of water a day?BBC World Service Duration: 9 minutes Fri 6th Jan 2017, 20:50 on BBC World Service Americas and the CaribbeanAvailable 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