I use two rectangular 10 gallon Nalgene vessels that I ordered from Fisher Scientific and they fit perfectly under my stand. The have them in sizes all the way up to like 50 gallons I think. You can find square vessels in almost any dimension you are looking for... so in a cabinet of some sort?
Nalgene is expensive but it won't leach. Otherwise get a good polyethylene vessel. Be careful of some of the cheaper vessels as they leach phosphates and other nasty stuff (had a problem withthis recently in my lab... who new they did this?). The leaching problem isn't important for drinking water vessels but it makes an impact here.
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