I have an old camping book that describes building a salt water still from a gallon paint can with a fitting brazed onto the lid. A coiled copper tubing condensor fits inside the can for transport.
The idea is that large lid allows you to clean out the salt deposits and it will pop off instead of exploding if the tube becomes clogged. I wouldn't put the lid on any tighter than needed, though.
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- Tom S.
"Never trust and engineer who doesn't carry a pocketknife."