Homemade Gatorade Calculations

Not everyone likes Gatorade, but it does appear to be the most researched sports drink in the world. There are hundreds of do-it-yourself recipies on the web, but I've never found one that actually shows how the calculations are done for easy to measure quantities (5/8 cup??). So here is my recipe which is accurate and also very easy to make:

1 gallon water, 1 cup sugar, 1/2 tsp salt, 1/2 tsp lite salt.

If you want to flavor it, add some lemon juice. How does it compare?

8 oz. Gatorade: 110 mg sodium, 30 mg potassium, 6% carb
8 oz. Homemade: 109 mg sodium, 36 mg potassium, 5.9% carb

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Let's do the math:
1 gallon water = 3785 grams.
1 cup sugar = 225 grams.
1 cup sugar in 1 gallon of water = 225/3785 = .059 = 5.9%

1 tsp salt = 2300 mg sodium, so 1/2 tsp = 1162.5 mg sodium.
1 tsp lite salt = 1150 mg sodium and 1150 mg potassium,
so 1/2 tsp = 581.25 mg each.

1/2 tsp salt + 1/2 tsp lite salt = 1743.75 mg sodium
and 581.25 mg potassium per gallon.
For 8 oz. portion, divide 1 gallon values by 16 to get
108.89 mg sodium and 36.3 mg potassium.