The whole issue of elecolytes and cramp is debatable to say the least.
If you sweat a lot and have a low salt diet you might get a bit low in electrolytes. ~Sodium (table salt)is the main one you need. Potassium (lo salt /bananas) and Magnesium ( indigestion tablets) are the others.
If you want to drink plain water then perhpas some salty snacks. Or you can get various energy gels and things with electrolytes – cliff shot blox IIRC have electrolytes and are palatable
Dilute apple juice witha pinch of table salt is palatable and contains a good mix of carbs and electrolytes
Edit – teh only time I have had bad cramp during exercise was riding longish distance pushing myself with a hangover. I blame that on both electrolyte depletion and dehydration