Apparently the medical benefits of traditional Coke (not the fat free, caffeine reduce, lime flavour etc) were discovered by accident but it is used a lot in the States to help geriatrics get over the effects of anasthesia (though does not improve spelling).
Triathletes have used it for years after open water swimming to avoid 'Trent belly' and it does appear to work. Perhaps it would be worth considering keeping some in the car/tent for after a long day in the fells drinking water from streams etc.
Note of caution, don't try adding rehydration salts or energy powder to the can; you won't have much Coke left to drink!