This article babbles on about water scarcity and how 11 billion humans..where we are headed I think...will have to do without. Actually there is plenty of water, what they are talking about, is getting it to the people where the people live. We consume a great deal of water and have tapped the natural aquifers that exist under the ground, and these take hundreds if not thousands of years to replenish.
But at the end of the day, if we can manage to pump billions of gallons of oil around the planet, I think we can pump billions of gallons of water around the planet...from the oceans.
Be a lot cheaper than roping comets!
Of course if we did that, that would be some major cowboying!