As I always say, remember that eating fruits or veggies that have water "locked in" their structure is better for hydration than drinking water.
"Healthy hydration is about the water you hold in the body, not the water you drink that passes straight through."
In fact, drinking too much water can actually be detrimental as it can deplete the body of vitamins and minerals by flushing them from the body too quickly.
There's nothing wrong with drinking water, but if we don't improve the capacity to get it into our cells and keep it there, it goes straight into the toilet without doing us any good. You can drink eight glasses of water - and while that is still a way of putting water into your body, it could mean eight trips to the bathroom without it actually reaching your cells. But the water consumed via food is absorbed differently. this is because it's surrounded by other molecules that help it get into our cells more easily, and work to keep it in our system longer. When we eat water-rich foods, we absorb water more slowly because it is trapped in the structure of these foods. That slow absorption means the water in food stays in our bodies longer, and brings a multitude of additional benefits. In fact, studies show that fruit and vegetables can hydrate the body twice as effectively as a glass of water. Take a cucumber, for example. The vegetable is 96 per cent water and might only deliver under 100 millilitres of liquid, but you'll absorb all of that liquid in a way your body can use, while getting nutrients at the same time."
http://m.nzherald.co.nz/lifestyle/news/article.cfm?c_id=6&objectid=11592281
