The following is from an old guy I used to know, he's passed now, but I believe it addresses dehydration in the bush.
He was scrub clearing back in the day, camped up on the hills, work all day, eat, sleep, work all day.
After a week he was getting crook. So he hiked into the nearby village and got some salt, thinking he'd take a couple of cups of very salty water, to flush his system out and start again.
He was fine after 30 minutes, it was not just a lack of water, but salt as well, from the sweating, of a week.
So in essence, dehydration is lack of water and salt.
All the glucose, potassium, etc etc, is icing on the cake and helpful, but not key, for the basic issue.
Whenever I'm camping or boating I use a little more salt in my meals, than usual.
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