<<Disclaimer: Verify this information before applying it to your situation.>>

I've had several responses - all flavors of Gatorade are gf and also
Pedialyte is gf.

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I highly recommend Pedialyte.  It is GF, and the best are the "sticks"
you buy, freeze, and then eat like popcicles.  They are hard to find
sometimes, but should be where the liquid Pedialyte is.  At Walgreens or
Eckerds, it is usually in the baby aisle.  Impossible to find by
yourself.  Ask a cleck or the pharmacist to help. I keep them in my
freezer all the time, just waiting for an accident.