You totally can. Sports drinks are just , salt, sugar, flavoring, and a ton of marketing.
Just try not to put too much salt in.
It’s going to taste bad though.
[So there’s many many people who add stuff and make their own sports drink.](http://www.5-a-side.com/nutrition/how-to-make-your-own-isotonic-sports-drink/)
You also might want to go with a kosher salt, a lot of table salt comes mixed with iodine to prevent iodine deficency.
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