necessarily something we need all the time. i want to be careful with this because obviously it's hot outside, so we don't want to tell people not to drink water, but what is the truth? >> use your thirst to gauge it. it is interesting, a lot of these studies came from a misinterpretation of a 1945 report that said you should have one milliliter, a fifth of a teaspoon of water for every cal raoefplt 1900 calories a day, that's about 64 ounces. then it became 8x8, 8 glasses, 8 ounces in a glass. what they misinterpreted it is at the end of it they say there is enough water in the food you eat. apples have 85% water. gear it towards your thirst. if you're sweating a lot and are outside you'll feel more thirsty and drink more. the 8x8 has never been proven to be effective truthfully. it goes become to 1945 and a misinterpretation. use your thirst to gear it.