Water.
For electrolyte replacement ( mostly potassium, sodium , and maybe magnesium), make your own. Go to your local grocery store and buy "Morton's Low /Light ? Salt.". It is something like 60% potassium and 40 % sodium. Add a small pinch to your drinking water bottle. Don't need much. If you can taste it, dilute it down.
Oh, that summer at Ft Leonard Wood, MO. They had those big lister bags on all the ranges. Some genius decided that the men weren't getting enough salt so they added salt to the drinking water in the bags. It would gag anyone. Many of the men were getting dehydrated because they couldn't drink the water without throwing up. It was like drinking sea water.
