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Everyone used to have a 'camel bag' on their hood ornament. It carried a gallon like a canteen, but it was a hairy burlap bag. You filled it, soaked it with water, hung it out in the wind and let it cool by evaporation as you drove. I can't find one or I'd have one. They took back the one I was issued in the park service.
What worked for me was quinine water (tonic water) with ..................
Sapphire Blue Gin.
Now hear this.....for fast AND high potassium intake COCONUT WATER.....you are welcome
Through bicycling I discovered Endurolytes tablets . Used to have to order them from Hammer Nutrition , but they are available in many stores now ; we get them at REI .They replace all the chemicals lost with perspiration and help body absorb water . Relieve cramps even after they start . I have never needed to take anywhere near the recommended dosage to stay comfortable .
I did a little easy research into foods with the highest potassium content, and amazingly it's the potato. One medium sized potato contains around 800-1,000 mg, which is about 1/5 of the RDA for an adult.
At 72, I get leg cramps in bed. They can be very severe.The doctors say magnesium. Tried that. No reult. Doctor said double the dose. Kidney pain. Stopped the magnesium.Tried that "deadly by some accounts" sodium aka common salt tablets. Cramps are gone in two minutes with one salt tablet (two tablets on the really severe ones).Seems to me that salt has become a bogeyman with the medical profession. Yes, it ups blood pressure, but only if it a constant high dosage. The occasional dosage when required is no problem.Administered as a tablet removes the salt on food desire.My 2 cent worthBrian