2 litres is how many cups of water?
Some organizations backed by bottled-water makers -- such as Hydration for Health, created by the makers of Volvic and Evian -- say that it's important to drink 1.5 to 2 liters (about 6 to 8 cups) of water a day, and that being even mildly dehydrated plays a role in disease development, McCartney wrote.