Oooo.... YUMMY!!!!Yup....found ours at the local mom and pop feed store. 60 gal food safe barrels with lids - approx $20 each. Needed to wash/air them out. They were jalapeno pepper and pickle barrels.
I have one esthetically pleasing wine barrel with fancy spigot and 2 gray plastic trash cans from Home Depot. I direct water from the rain gutters into the barrel first. Then I run an overflow line to next gray can and then another to third. Three fill in minutes with a downpour even in desert climate. Don't be fooled. Problem is keeping it from getting icky in our warm climate. I cap cans with their lids to keep dirt, rats, birds and kids out. Pardon my bluntness but finding a dead animal in a barrel can ruin your day.
I get mine off of Craigslist, but that's sporadic. Nice thing is you can get food grade barrels (which I'd go with honestly, even just for watering plants) on the cheap. I spent $7.00 a barrel, with lids already pre-threaded.
At the price of barrels and the nominal cost of PVC plumbing to hook them together, I'm considering building a stand under the deck outside and lining up as many as I can, connected at the bottom to a central tap that would protrude out of the front of the deck and look "normal". Out of sight and I'm wagering I could store at least 550 gallons under there, rough estimate.I agree with SonOfLiberty on the barrels, this is similar to the set up that I have ready to put in place! Locally, I can get blue barrels for $8 a piece. I just bought two "Lemon Flavored" barrels for a bit more, but I fugure that for the added lemony taste in my drinking water, it was worth it!
When you say clean are you referring to clean enough for watering the garden, feeding livestock, etc. or to drink? In an emergency I would drink it only the following were metLike others said,I'd say plastic 55 gallon barrels.I have one at each corner of my house.That gives me up to 220 gallons of clean water.