The 8 glasses a day was apparently a misinterpretation of advice given many decades ago. Obviously it depends on the rest of your diet. Fruit, vegetables, tea, coffee etc all count. Go by the colour of your wee. Pale straw.
So Harry and family are coming back!




, so can't be doing with an acidic drink). Oh and yes, I do drink tap water as well. All these are liquids, for heaven's sake so they all hydrate.