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I've been using distilled water for couple years now and I hate having to re-fill it every couple months or so. I know I'm supposed to use Propylene glycol, but when I ask for it walgreens or cvs they look at me like I'm growing horns out my head. Any ideas where I could find some, or a similar inert liquid (with a similar viscosity). Thanks for the help in advance.
Jeff.
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Jeff.