(no subject)
The phone rang around 8:30 this morning. That was early enough to be plausibly important, so I answered. The caller butchered my name (my last name doesn't even have several of those morphemes); my suspicion that it was a junk call was soon confirmed.
She was calling from "Concerned Women for America". She got about three more words out before I said "don't call me again" and hung up. That was based on the rudeness of a solicitation at that hour, but I also had a negative reaction to the name of this group I'd never heard of before, and I found myself wanting to look them up while on the phone, with no computer immediately to hand. Every word in that name except "for" set off a warning bell (and "for" is on probation due to proximity). Taking them in the order the alarms sounded:
- "America": in a political context, high correlation with rabid right-wingerss
- "Women": you're going to try to categorize my beliefs, interests, and priorities, and you will be wrong
- "Concerned": you have a crusade
Maybe I don't want a neural link to the internet. It's much easier to scrub the pollution from a browser cache when it's on disk.

I send lots of e-mails each day.
There's still quite a bit of debate, but most authorities seem to at least acknowledge both positions have possible merit.
It's sort of like arguing e-mail vs. email: a lot depends upon your style manual.
Re: I send lots of e-mails each day.
People use it that way, but that doesn't make it a sound usage. "Email" (with or without hyphen) is analogous to "mail", that paper stuff you get most days in your physical mailbox. Do you get "a mail" or "three mails"? No, of course not -- you get a letter, a bill, a notice, an advertisement, a dire threat, a package, or whatever, but you don't get "a mail". You do get "mail", however. I want people to use "email" in the same way. I recognize that I am doomed in this regard.
Re: I send lots of e-mails each day.
Words that are mass nouns for one meaning often are counting nouns for others, usually beginning in a technical context. For example, "I drank a water at every other water stop during the marathon. I drank seven waters total" would be a common thing to hear at a marathon.
And, as you point out, there's the whole "Waters of Babylon." It's not a common usage, but it is acceptable because it's a different meaning. It's quite similar, though not exactly the same as "There were three different waters available at the Fish Show setup: low osmolarity, brackish, and saltwater."
This is how languages grow and change.
Firefox is marking "osmolarity" as incorrect. Sigh.
Re: I send lots of e-mails each day.
I drank a water at every other water stop
You're using "a water" as shorthand for "a {serving, bottle, glass} of water", like when people talk about drinking "a Coke". "Waters of Babylon" is correct in that kind of context, but it doesn't make "waters" as a plural noun correct globally. Context matters.
I can't dictate usage nor am I trying to. I just think it costs very little to be precise and precision reads a heck of a lot better.
Re: I send lots of e-mails each day.
So if you acknowledge the shorthand possibility, say "an email" is shorthand for "an email message". Problem solved, no?
Re: I send lots of e-mails each day.