I agree. One quart isn't very big and is going to have to be refilled several times a day. My flock of 20+ has a 1.5 gallon one in their side and the smaller side with 8 has last year's gallon waterer. I have to fill the larger one daily, as it is empty, and top off the smaller one daily for it doesn't hold 2 days worth of water. (Winter is the only time I regret my choice of Sand in my coop. They manage to fill the bottoms of the bowls with sand daily, so I have to take an empty bucket down to dump the dreges in. Just another step I don't enjoy in the cold of winter)One quart is a very tiny bowl. I'd get the gallon ones. I got a bunch at walmart for $5 last summer on clearance, but around now they usually run around $20-$25, like this one:
http://www.amazon.com/Farm-Innovators-2-Gallon-Round-Heated/dp/B001G1C8BQ