Actually, my son and his girlfriend tease me all the time about the Smart Water. That's the actual name.
It's a little expensive.
I was looking for something with potassium in it and it fit the bill.
I'm not a scientist, I'm a writer and have an interest in nutrition.
I bought it at my regular grocery store. However, I have also seen it at Wild Oats (natural food store).
Perhaps it will eventually be available at places like Target. I wouldn't doubt it.
I sometimes drink Propel Water. My daughter's doctor drinks this when she exercises. You can get this anywhere.
A friend of mine, a biology professor, drinks water mixed with a little gatorade.
All of these things probably have potassium...the key ingredient.
To the best of my knowledge, all of us only drink these items when exercising...so it's not over the top expensive.