Originally Posted by rm -rf

I saw a comment to use fast food burger joint relish packets!
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It's not the electrolytes:
From an older thread on hydration recommendations, I posted:

Most leg cramps I've seen in cyclists seem to be related to harder than usual rides. Bigger steeper climbs and more miles than usual. Not an electrolyte or dehydration cause.

pickle juice
Some of the local hot summer event rides have small cups of pickle juice at the rest stops.
Now, newer studies show that just a sip of pickle juice triggers a nerve reflex in the throat to short circuit some cramps. Ha, that's interesting. (The studies weren't with cyclists, though.)

For example, from the Washington Post:
How to get rid of leg cramps? Try pickle juice.