108 gallon stack barrels (53 gallons each) by Arid Solutions
This is a 200 gallon barrel in a backyard.
Metal dome in the top center is just a bowl I turn over to keep it from becoming a birdbath. We added the gutters for less than $100. Dear Husband did the work, materials were from Home Depot.
I thought I'd provide a few references and ideas for you handy-people who want to have a little more clean water for your home use. If you live near a Farm, Ranch or feed store, you can usually pick up a 30 to 50 gallon barrel that can be easily converted for rainwater harvest storage for under $50. I like using rainwater on some of my plants because our groundwater is alkaline. Even when using containers and potting soil, I can't grow blueberries without rainwater -- too alkaline! Kills them fast.
When deciding how large a system to install, consider your rain seasonality, roof size and budget. Some sites have calculators that allow you to plug in your rainfall and roof size, but essentially for every 1000 SF of roof and 1/2 inch of rain, you have potential to collect 300 gallons of water. The first little bit of rain may be needed to wet the roof, especially with standard shingles, but after that, it's yours. My 200 gallon barrel has a diverter that goes to an old boxwood hedge. It is lush, so I need to re-think that and put it to better use!
My favorite DIY is using corrugated metal culverts. It's definitely work, because you need a concrete pad, but the cost is manageable in bites as you go along. A 46 inch culvert, 4 feet high will store 300 gallons of water. A good, frost-resistant commercial tank will cost you about $600 for the same capacity. You can probably do better using this method or if your area has prolonged freezes (or are a glutton for punishment) and need it to be below ground, this one.
In areas with an urban runoff problem, rooftop capture can be a great method to reduce the runoff, especially if the entire neighborhood decides to harvest their rainwater. It can reduce your water bill or electric bill when you buy or pump less water. Worst case, add a little Clorox (maybe run it through a coffee filter) and you can drink it!