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How to make new metal jerry can safe for potable water without rusting?

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Huck Wild:
I got a metal (NOT stainless) jerry can (sportmans guide military reproduction) and I want to store potable water in it. I washed it out with blue dawn to get rid of production contaminants and it started to rust after letting the soap stuff sit overnight.

So how do I clean it out to potable quality and keep it from rusting without using petrochemical coatings? The reason I got metal i/o plastics is leaching concerns.

Stwood:

I was thinking use the coatings that is sold to seal car gas tanks, but the chemicals are most likely not safe. So....can't think of anything else.

Black November:
Don’t do it.

Just get a food grade container
https://www.lexingtoncontainercompany.com/Military-Water-Cans.html

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