I just found another type of water container today at Kmart that might be better than the aquatainers. The Blitz 6 gallon water containers.

http://www.amazon.com/Blitz-50863-Water-Container/dp/B000CINB42

They were about the same price as an aquatainer, but holds 6.5 gallons. They seem a lot more durable than the reliance ones, and the size and shape is a lot easier to manage than the 7 gallon aquatainers. Haven't tried it out yet, so I won't know how durable it is for a while.