Haven't been to the Everglades, but I know the insects in the region. They laugh in the face of bug repellent. I'd do DEET, long sleeves, and a net covering exposed parts. Treat all your clothing with insect repellent (better than nothing). Make sure there is some space between the net and your skin. Seal all other parts. If there is a hole, a bug will crawl in there.

Try some sort of prayer. There is a reason that one of the proposed state flags of Mississippi is a big mosquito.