recommend 'sports drink'?

I recently joined the Y and began a lap swimming program which I love. The first thing I noticed is that I feel dizzy when exiting the pool for about 30 second to a minute, and then I'm fine. Also an occasional cramp in calf that lasts for a lap or 2 and disappears.

Someone recommended trying a ‘sports drink’ but I am not familiar with them, and I need to stay away from sugar.
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Can anyone please recommend one, or maybe have a homemade concoction I could try? Tweet