The other two commenters are exactly right. To test this, [hold your hands over your mouth like this stock photo](https://c8.alamy.com/comp/EN7WGJ/portrait-of-a-young-man-with-hands-over-mouth-EN7WGJ.jpg) and exhale. You should be able to feel the humidity of your breath on your hands.
It’s such a small amount of water, most of time you don’t notice, but you are constantly exhaling a little bit each time, and there’s constant evaporation from your skin and eyeballs.
It’s a good idea to drink a lot of water because if you drink extra, you just pee a little more and there is no problem. If you don’t drink enough, your body starts to work less efficiently because it runs low on water and you get dehydrated.
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