I use the Morton’s lite salt, I keep the dry ingredients separate and in the car, I also carry a small mix in my personal kit.
I have seen people collapse and even die from heat problems in the army, and have seen some problems with dehydration issues in civilian life.
I keep it in the house just for this very survival situation of diarrhea that is described.
I always look for cheap, simple, and long shelf life, for survival solutions.
Have a pleasant weekend.