Could you use Ethyl Alcohol as antifreeze? Not sure what quantity you need, but it'd be fairly non-corrosive and very resistant to freezing. It would be non-toxic (well, depending on your definition - especially bad for a pregnant woman...) and easy to detect by its scent if a leak did occur. I don't drink beer or liquor, but I'll take Ethanol any day over ethylene glycol.
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