I generally take great interest in threads such as these, and others about cleaning-rinsing, etc., as well, that can discuss the actual science, and appropriate products, without perhaps the need to shell out $40 for a 1/2 oz of cleaner, such as what LAST charges for thier Power Cleaner.
I'm sure we would all like knowing to what point of purity is "ideally" needed, then to what point there are then diminishing returns, and what boundary we should recognize for a "good enough" grade of water.
Of course, we all read the posts day in, and day out about those who will claim 'Hey, I use my Tap Water run through my Britta, or Wally World Distilled with perfectly flawless results, without any scientific testing-study-research to back those claims.
Out of curiosity, I've browsed suppliers like Fisher Scientific, and seen water prices that would make even Michael Jordan cry. Things like DNA grade, which I'm sure does not need to be in a Vinylphile's aresenal.
Part of the ethical problems I see, is while many of us patronize many good companies, we all mostly trust such good companies such as Walker to provide us with very good products.
With that being said, I would not at all feel comfortable contacting somebody such as Lloyd, and saying something so stupid, such as: "Hi Lloyd, what grade water do you use, I like it very much, works fantastic. but wish to bypass spending $88/gal for your products". See what I mean?
About expiration dates, and of course suitable storage containers, and transference to them, do we actually need to don clean room-biological repellant suits so we now look like the folks in the Dustin Hoffman movie "Outbreak"? Mark