Not sure if jewelweed grows in Florida, but up here in Michigan anywhere you find poison ivy there is usually jewelweed growing right next to it. Google search it it is also called pitcher plant. Growing up I got P.I. 3 to 4 times a Summer until I found out about this plant. What I do is if I believe I have gotten into poison ivy I grab a large handful of the plant especially the stems and crush them in my hands. They are very watery so no problem getting enough "juice" out of them. Then just rub juice all over skin and clothes
I have not had poison ivy since I was a kid but always use this trick just in case when in the woods. I pick mushrooms so I am walking thru poison ivy alot.
Hope it grows near you