http://news.bbc.co.uk/2/hi/health/7153880.stmResearchers from the Indiana University School of Medicine in Indianapolis hunted medical literature for evidence on each claim.
They found no evidence supporting the need to drink eight glasses of water a day.
In fact, studies suggest that adequate fluid intake is often met by drinking juice, milk, and even caffeine-rich tea and coffee.[continued]
Oh thank goodness. My health just improved dramatically...again.
It used to be that coffee was bad and sure to be the death of me. Now it acts as a supply of water, it is high in antioxidants [the greatest source by far in many diets], and it may even help prevent the onset of type II diabetes in adults who are predisposed to it, as I am.