<<Disclaimer: Verify this information before applying it to your situation.>>
I received several responses that said the following were gluten free:
Country Time
Minute Maid
Kool-Aid
I also got one response saying that they drink Tropicana with no problem.
And I also got a recipe on making your own:
2 cups lemon juice
2 cups sugar
13 cups of water
and this all makes 1 gallon of lemonade.
One serving is:
2 Tablespoon lemon juice
2 Tablespoon sugar
3/4 cup water
Thanks to everyone that responded! =)