Used to drank gallons for years and alot of salt including himalayan salt. All it did was flushing minerals and nutrients out of the body, that is what water does at higher amounts - it's a solvent and at higher amounts it actually dehydrates and causes electrolyte imbalance. It only made muscle weakness worse.
I have been drinking a lot of water and salt. It has been making a huge difference in my energy levels.
You might be interested in this blog post.
(I'm seeing POIS as part of the syndrome around ME/CFS/POTS and whatever else there is going on)
Oral Rehydration Solution More Effective than Saline IV at Improving Orthostatic Intolerancehttps://www.healthrising.org/blog/2020/09/15/saline-ors-oral-rehydration-pots-chronic-fatigue-syndrome/"A recent study indicated that most people with ME/CFS, when they have POTS or orthostatic hypotension or not, have reduced blood flows to the brain."
"Many people try to increase their blood volume by adding salt to water. Drinking large amounts of salt water, however, can be dangerous ? and Medow reported that ?conventional oral hydration? techniques are not effective in improving orthostatic intolerance. Drinking a lot of salt water will cause the water to go into the tissues ? not the circulation. Then the sodium has to be excreted ? potentially causing declines in potassium."
"The ORS Medow used derived from the World Health Organization formula and contained glucose (dextrose) ? not sucrose. Plus it?s vital that the ingredients be combined in the specific portions specified by the WHO.
The glucose/salt combination creates an osmotic gradient consistent which produces
?nearly complete fluid and salt absorption via the intestinal Na+-glucose co-transport (GLUT2,symporter) carrier?"
EDIT: I'm now trying German alcohol-free wheat beer for rehydrating, mixed with lemone containing vitamin C, sprinkled with some normal salt.
"Sport doctors say non-alcoholic wheat beer boosts athletes' health"https://www.eurekalert.org/pub_releases/2011-06/tum-sds060811.php