This Instructable will be an overview of how to setup your own rain barrels. This may not show 100% step by step since I've found their is a great variation to how you want your rain barrels to work and the setup you use. I will try to point out all the options and variations so you, yes YOU can decide how you want to do your setup. This setup is for using gravity and a pump setup for a later Instructable. The later Instructable will also include how to hook it up to a toilet and setup an additional faucet.
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.