So, why does it matter how much water is in a glass, anyway? Well, for one thing, drinking enough water is essential for staying hydrated, which is crucial for just about every bodily function (except maybe sleeping - although, if you're drinking too much water, that can be a problem too...).
But here's the surprising part: even the experts can't agree on exactly how much water we need to drink each day. Some say eight glasses, while others claim it's more like two litres (which, if you're keeping track, is roughly 67.6 ounces - yikes!).
And don't even get me started on the myth of the "eight glasses a day" rule, which apparently originated from a 1945 report that recommended people consume about 2.5 litres of water daily (which, it turns out, was actually meant for sedentary women - not exactly the most active demographic...).
