A friend of mine posted this recipe on her Facebook page and it reminded me that I used it when my boys were little. It was less expensive than buying a bottle of pedialyte that we wouldn't use all of. I always did have and still always have these items on hand.
1-teaspoon baking soda
7-teaspoons sugar (get those electrolytes up!)
1- (1/4 oz.) packet unsweetened kool-aid -OR- lemonade mix (any flavor)
1/2-teaspoon salt or salt substitute
Mix all together.
Store in fridge for NO more then 3 days. Can be made into ice cubes.