It's not nearly as bad as coconut milk, which is why it's used instead for electrolyte replenishement.
Sports drinks like Gatorade or Powerade contain at most four essential electrolytes. Coconut water contains seventeen.
I used to have the same problem when I was in the army. I sweat heavily, especially in body armor, and after a few hours either on a range or patrol (two tours, OEF/OIF) I'd begin to shake a little. I always carried powdered Gatorade mix and the salt packets from my MREs. I'd take the salt like a BC powder and mix a little Gatorade and chug it, and the tremors would go away.
I try to mix my fluid intake about 15% sports drinks and 85% water, and use salt and coconut water as supplements as needed (because coconut water, while effective, is expensive and tastes like sh**).