even if you freeze and then sanitize plastic bottles of ice, you still have minor sanitation concerns. Are you referring to fermentation control or wort chilling post boil?
I built my own immersion chiller for a little under $25. not hard at all, but I also toss the kettle I an ice bath. ;D
Yes you can do that, as long as its clean.
Palmer mentions it.
http://www.howtobrew.com/section1/chapter7-4.html
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