You need to take into account that we sometimes use our drinks like a comfort food, and tend to drink more than we really need when it is easily available. Watch when your occupied even when it's fairly strenuous you tend to drink less than when sitting around watching TV or working at less strenuous jobs. Watch construction workers in the summer (or your buddies if your a construction worker) they drink as much as you would in the field and for the most part they drink less than a lot of the folk who made these entries talk about.