Gardening

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or even off a corner of a vehicle - like a half-ton pickup that grabs quite a bit in the box,

I use old bathtubs, lots of them in dumps, or offer in newspapers or on the web to pick them up

if $$ is not an issue, buy 45 gallon rain barrels or garbage cans(cheaper)and collect every drop you can

I've lived without running water for over 5 years, and during a rainstorm I'll be out there in my bathing suit running around collecting water in 10 or 20 litre pails everywhere I find a decent drip,

and then putting the water in bathtubs, or 70 litre garbage cans (plastic) I bought just for that purpose - never use them for garbage

can't go wrong with rainwater methinks

It's work,

but well worth it!