A colleague on mine who once ran an ecological survey in the desert mentioned that her fluid of choice for extreme dry heat was V8. Pretty much anything else would cause horrible salt deprivation.
That is contrary to medical advice, which is that you need to replace electrolytes after you sweat a lot.
https://www.bbvaopenmind.com/en/science/leading-figures/how-...
> The most critical need, hydration, would be solved by squeezing the fluid from the fish and collecting rainwater, supplemented with small doses of seawater that did not exceed one litre a day—one tablespoon at intervals of 20 minutes, allowing the saliva to dilute the salt in the mouth.
I once stayed at a Caribbean resort where they had a chilled machine labelled "cow juice". I assumed it was milk, but was not brave enough to try it.