I'm not sure if you've seen one of these coffee machines. When you come to one, your first thought isn't "where do I put water", it's "what kind of coffee do I want?"
The article already has a picture and it is a bit different than that.
Even with machines where you have to put the water in you don't have to do it for every cup, most likely people either put water when they put in beans, because that's what they are used to, or perhaps when the machine isn't working properly and they are trying to get it going again.
Here it is, to the right of a Keurig coffee pot: http://static3.businessinsider.com/image/4ef3bec5ecad04cd2c0...