I use store bought 7 gallon containers, from the camping section. Just curious, it takes an hour and a half for our RO/DI unit to make about 5 gallons -- how long does it take yours to fill up a 5 gallon bucket (since you said you don't like to have to check on it)?
Brute trashcans are made by RubberMaid. I bought a 50 gallon one with wheels, but ended up returning it because we decided it wasn't cost effective -- $60 for it at HD. We could buy 7 of the 7 gallon cans for $50 and have only 1 gallon less of total storage. Plus, we could store the 7 gallon cans wherever (they are stackable), and the 50 g Brute was going to need to stay outside (try convincing your wife you need to keep a 50 g trash can inside your house).