Wrestlers aren't really a good reference though because they intentionally dehydrate before matches in order to qualify in a specific weight class.
The other way of looking at that might be that they are perfect subjects for the study of rehydration
Anyway, did a bit more piecing together for a notional, cheap and convenient, dry-powder electrolyte recipe for camping/hiking etc. and it currently looks like this:
1/4 tsp salt substitute which is mainly made of Potassium Chloride
1/4 tsp baking soda for the Sodium .. baking soda, not baking powder
1 pinch of table salt for Sodium in a different form
1/8 tsp epsom salt for Magnesium (this also a laxative, so exercise caution when dosing)
1 tsp glucose
Stir it into a litre of water and drink up.
If it's available to you there and then, OJ for flavour or fresh lemon juice or lime juice will up the Potassium content.
I fully expect this will be refined over time as the errors start to show themselves. There are lots of other ways of getting these things from ready-made drinks, stock cubes, fruit and the like, but as a simple, affordable, no-headaches powder to put in your bag, a couple of doses of, this should do. It'll help, in any case.
Ideally, it could do with a bit of Calcium in there - maybe some Calcium Citrate, or perhaps a Tum. It turns out that Sodium Citrate as an ingredient may not be the good idea initially imagined, since it removes Calcium, apparently.
So, if you intend legging up a mountain in the warm weather and don't want to hike a big sticky bottle of Gatorade with you, this might be the thing. I still think leaving out the glucose and using the preparation to season a bag of hand-curated, fruit'n'nut trail mix might be the way to go
The saltiness will encourage you to drink. In that regard, squash and pumpkin seeds are good for Magnesium and Phosphorus, dried apricots for Potassium. Jerky can be good for Sodium, depending on how its made.
It might be best to keep the glucose separate, in any case, and maybe take it along in a different form (or another slower-acting carbohydrate) as it will spike your bloodsugar. You may or may not want that The salts alone will then be easier to store and transport in traditional paper wraps.
Note that, as well as helping with mood, tiredness, executive and muscle function, all these things act in concert to retain water in the body. So, bear that in mind if you have any medical things going on