Simple, go south on I-75 till you See the Bushnell exit. At the Pilot station they gave a dump for $10 and there is water. Wanna see a pretty old FL town? Stay on that exit road on Rt.48 to Floral City. Place to eat on the right just before the light. Nice drive too!

Three Flags

Probably Three Flags. You might have other choices at nearby state parks, though you'll pay a fee.

We are thousand trails members so we used three flags in Wildwinds. It's was free to members.