Should we really be drinking eight glasses of water a day? (BBC More or Less)

How much water should you be drinking? There is some age-old advice that suggests you should be drinking eight ounces (230 ml) eight times a day. Some people even advise you should be drinking this on top of what you normally drink. There is lots of advice out there but how do you know when you?ve had enough or if you?re drinking too much. With help from Professor Stanley Goldfarb from the University of Pennsylvania, Wesley Stephenson finds out.