Back in the late 70's early 80's, I used to visit a dairy farm to buy milk.
Most of the milk tanks were huge and sat in a cluster up by the processing
building. However, there was one little milk tank that sat all by itself
down by a dirt road at the back of the farm. For those who knew the secret,
we could bring our own containers, tap the spigot, and place our payment in
the coffee can on the ground. The owners retired about ten years ago and
sold the dairy. I have not been out to see if the little tank was still
there and stocked since.