OK it was what I expected.

TLDR; the “horse” part of this wasn’t the problem other than that it’s easier to purchase an unhinged quantity at a veterinary supply store. If he was reconstituting to the proper strength (being sober would have helped with that) the electrolytes themselves wouldn’t have been an issue (and honestly are actually beneficial when imbibing).

I figured it had to be, iirc from reading veterinary metabolic panel normal ranges most of us placental mammals have roughly the same electrolyte balances. Afaik it goes back to whether you have a common ancestor only before or also after leaving the ocean and that your balance is reflective of the ocean’s balance at that time.