To start, this setup cost me less than $30 dollars to do with free barrels. You can do it for cheaper with one barrel or using other parts. I designed this to be able to be expanded (10 - or maybe more barrels :-D) and to include a pump.
This took me a week to do because I could not decide / find all the right parts but once i got one adding the other took me about an hour to do. I'd suspect that this could be done in a matter of an afternoon with all the parts at hand.