Drink when yer thirsty. Who knew?!?!

There is simply no need to drink water all day. Sorry, Nalgene, we're on to your game.

The supposed health benefit of consuming large volumes of water has become one of those urban myths that even some physicians have come to endorse without real insight into the science underlying water intake and its effects on the body. ...

Our young woman toting around her bottle of water can only retain a few extra ounces in her body no matter how quickly she drinks it. Moreover, the amount she can retain is truly only a drop in the bucket. The svelte 5'9" woman who weighs, say 125 lbs., has about 75 lbs. of water (about 35 quarts) in her body. The extra water retained in a few sips hardly increases the body's content of water and even then, the excess is rapidly eliminated in the urine. Therefore there is no possibility that consumed water can make a sustained difference in anything but how often she needs to find a ladies room. ...

And by the way, there is no evidence that the few ounces of extra water in the system improve the luster of your skin, either. Given the fact that those few ounces distribute themselves uniformly in the 35 quarts throughout the body--including the liver, muscles, brain, and skin--you cannot notice them. The idea that drinking water can "flush out impurities from your system" is an idea that also belongs in the toilet. The kidneys handle water in a manner that separates the amount of water excreted from the elimination of the waste products of metabolism as well as salt, potassium, calcium and the many other components of the urine. Drinking all that water dilutes the urine but does little else.

Read the whole thing.
I seem to gag and choke whenever I drink water anyway, so this is fine news for me.