Well, that's the picture text, any, the blog post says that this isn't really the case. After all, "It's clean, distilled water, but it will have traces of the catalyst. Plus, the tailpipe is a little dirty." Then there's this:
Not much there we didn't know already, and we've seen similar demonstrations before (see video below, starting at min. 5), but it's still interesting, no?
A fuel cell doesn't produce enough water to fill you glass. When we drink tailpipe water for a camera, like Ben is doing in the picture, it's not more than a few drops. If fact, fuel cells produce about the same amount of water as gasoline vehicle – about 1/3 cup for a full day of driving.