This is our recipe. Makes 1 gallon.

2 packets unsweetened koolaid or other flavored powdered mix
1/2 tsp Morton Lite salt (potassium)
1/2 tsp sea salt (sodium)
3/4 - 1 cup sugar (to taste)
4 quarts water

heat up 4 cups of water to properly dissolve all the dry ingredients, combine remaining ingredients.

there are many dry mix flavors out there, but koolaid brand seems to be the best. we prefer the sharkleberry fin.