Morton Lite Salt and Vitalyte.

(This is a tangent to other low-salt discussions on TFL.

I came to Morton Lite Salt via Vitalyte, which used to be known as Gookinaid, and before that "E-R-G" which stood for "Electrolyte Replacement, with Glucose."

https://vitalyte.com makes a great isotonic sports drink. Nutrition info here:
https://vitalyte.com/collections/shop-vitalyte/products/fruit-punch-glucose-replacement-drink

When mixed according to directions, Vitalyte has, per 8 fluid ounces:

67.5 mg sodium. ( 2.93 mEq.) 
96.5 mg potassium. ( 2.47 mEq.)
11 grams carbohydrates, of which 10.5 are sugar.
45 calories.

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I'm cheap and wanted a less-expensive DIY version for my hydration/sports drink, that also has less calories.

I discovered that Morton Lite salt, a combination of sodium chloride (regular salt) and potassium chloride, is close to the isotonic Vitalyte in the amount of sodium and potassium.

https://www.mortonsalt.com/article/morton-lite-salt-mixture-nutritional-facts/
https://www.amazon.com/Morton-Sodium-Healthy-Alternative-Canister/dp/B00473OJ3A?tag=froglallabout-20
https://www.walmart.com/ip/Morton-Lite-Salt-11-oz-Canister/10318920
https://www.kroger.com/p/morton-lite-salt/0002460001041 

From the Morton Lite Salt label, it has, per 1/4 tsp:

290 mg sodium.
350 mg potassium.

I dissolve 1/4 tsp in 1 liter of water.  1 liter is 33.8 fluid ounces.  

Using a 1/8 tsp measuring spoon makes it convenient to mix in a 1/2 liter bottle of water.

Mixed this way, Morton Lite Salt has:

290 / 33.8 = 8.58 mg sodium per fl oz.
350 / 33.8 = 10.35 mg potassium per fl oz.

Multiply by 8:

  8.58 * 8 = 68.6 mg sodium per 8 fluid ounces. ( 2.98 mEq.) 
10.35 * 8 = 82.8 mg potassium per 8 fluid ounces. ( 2.12 mEq.)

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The MLS container has 311 grams of product, and the label says there are 222 servings of 1/4 tsp per container. That would be enough for 444 half-liter bottles.    Using Kroger's price of $2.99 per container, that would be .67 cents, yes, only 2/3rds of a cent, per half-liter bottle of water.

Granted, that does not include sugar or flavoring.

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It's not an exact substitute, but Morton Lite Salt is available at a very reasonable price at Kroger and Walmart.

Sweeten and flavor according to your taste and calorie needs.

To get Vitalyte's amount of calories per 1/2 liter, add two tbsp of regular table sugar, 22 grams to be exact, to get 88 calories.  However, be advised that Vitalyte uses mostly glucose, and a little fructose, not table sugar (table sugar=sucrose).  Glucose, in the form of dextrose, a.k.a. corn sugar, can be obtained from beer brewing supply stores. 

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Vitalyte has a small amount of magnesium and calcium. So if you want to get more exact, you could add those too, but the amount is miniscule - insignificant compared to the sodium and potassium. I'll leave the calculations to you.  

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mEq, milli-equivalent, calculator: http://www.nafwa.org/convert1.php