OK it was what I expected.
TLDR; the "horse" part of this wasn't really 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.
It sounds like there were a few trace minerals that might have built up if he'd kept drinking it in it's intended strength chronically but the core issue was him drinking essentially a straight salt slurry.










I liked the bit in the 3001 space Odyssey (the one where they unfreeze Frank and his lack of a foreskin gets him ghosted)
"Nowadays everyone's either a deist or a theist. The theists believe there's at least one god and the deists believe there's less than or exactly one god."