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It's possible (probable) that some oxygen has gotten through the HDPE jug, yea, but anything from the plastic itself is harmless to your system. Keeping it stored in a cool dark place would help also.
ive wondered this myself.i used some distilled water from my opened jug(2 months opened)
and its so far so good.been running it now for 4 months so wee will see
short of anything obviously growing in it, its fine. Boiling it wouldn't add too much in the way of impurities, since distillation is just a boiling process and the condensation probably takes place in a metal loop. If you were talking about deionized (DI) water, then boiling it would be adding more impurities that would be coming off the metal pot. You're going to have some kind of biocide in your loop anyway right? then just go for it
I had some in an opened and re-sealed container with biocide that I kept in a closet in my computer room.
...for a year...
When I opened it, it had a bit of a smell, the moldy yucky kind of smell. So, my recommendation is to simply throw out any unused/opened water and just buy new. If you keep it longer than just a few weeks, you will probably have microbiology in a jug. Not worth the risk.