It's good to see the Martian is getting good reviews. I'll see it eventually I'm just not sure how much I can put myself out of "NASA employee" mode to enjoy it. For instance I enjoyed Gravity but I could help but roll my eyes and call BS multiple times during the film. I remember reading the preview chapters on Amazon for the Martian and saying the same thing. :|
I know, I'm in a unique position for this stuff but that's why it's my POV. :)
When we find water that will be true. None found yet. Just remnants that seem to be streaks on the side of a crater, like finding a bathtub ring and assuming someone took a bath in water. But it could have been Peroxide, or another liquid that can leave hydrosalts behind.