Can salted Coke do the trick?

I was in a grocery store today and wanted to see whether they have any sport drinks. They had arround 4-5 kinds and I was surprised to see Gatorade. And even more surprised to see that 500ml (17oz) bottle costed 1.69 Euros!!!!!! What a rip off.

I guess that I will be fueling my rides with salted Coke:)