A hot tub is a good water source. I think mine holds a little over 900 gallons. I bought an ozonator with it which cleans the water to 99.9% clean of water born pathogens. You only have to ad a cap of chlorine each month. Very low maintanence.
I had (and lost) the number to a member who had some blue poly drums for sale. A little help here...........
Just a thought.... If you store the barrels upright and you lose power you'll need some kind of manual pump.
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