Timely comments when taken in the context of these articles on hydration from earlier this spring. http://www.utsouthwestern.edu/utsw/cda/dept37389/files/217322.html http://content.nejm.org/cgi/content/short/352/15/1550 Interesting to say the least, (note: I'm not qualified to say weather the content is right or wrong).
my own recipe is to make a mild ribena (black currant cordial) with a pinch of salt ... it works fine for me for the past years ... cheaper and less complicated mixture of "sport drink"