Of course drinking water is necessary and I'm pretty sure we don't drink enough. I'm also pretty sure that drinking more water is good for your skin, etc.
However this picture is bullshit:
And it is very very easy to see why. Forget photoshop: There is another indicator that this photo is an unfair representation of the story. Look closely - do you see it?
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Look at her eyes. In her eyes, you can see the reflection of the flash that was used to take her picture. The flash is situated just behind and just above the photographer, which would paint a rather flat, full light on her face, hitting it directly, creating little to now shadows.
In the picture on the left, the flash is higher. This makes her nose create a shadow obviously, but her cheeks and eyebrows are also casting a shadow.
Even if the article and photographer claimed no photoshop, it wouldn't matter. The slight difference in the angle of the flash makes a huge difference.
However: Drink more water anyway. It's Good and good for you.