huffpo is blocked at work; how fast will it fill a water bottle?

Depends on humidity and temperature, at about 75-80 oF and 50% humidity, 0.5 liters in an hour. It's not road ready yet.

Unfortunately, it works the best when you want to drink the most and at any time it doesn't keep up with demand. This is pretty much worthless, apart from the novelty of it.

Probably, but if through design iterations they increase the surface area or power, maybe they could bump it to a liter an hour.

I wouldn't be so quick to throw it out.

Sure, it may be useless for triathlon or road racing, but for Ultra-long distance events- think randonneuring, touring, RAAM, those crazy long MTB races out in the wilderness with limited support like cape epic- it may be interesting.