Buy a simple army survival guide. It gives very awesome advice on shelter, fire, cooking, drinking, eating, and hunting/trapping. I love it. I wish I had the choice of yours.
Don't eat mushrooms. Just don't. You HAVE to develope an eye for them, you can't go off books. Go west along the south gulf, plenty of plants and animals there. Take trains if you want fast change.
Look for a bufo alvaris (colorado river toad) when you're in that area. They are in fields near streams. Very large! Most potent DMT source in US naturally (I think).
Otherwise, my friend... look for people's gardens to raid, salvia, pot are grown in places. I'm sure in the bayou there are berries and nuts with high alkaloids..
Be careful
I'm jealous
If you'd like, I would like it if you pm me, just to talk a bit before you go. That kind of decision comes from an interesting person.
By the way, if you go near outskirts of town (i mean really close to town or street, a block or so from a street) there are rabbits galore usually.
Buy snare wire. This is by far the BEST weapon you will have, especially in northern areas.
I once caught 7 rabbits and 2 foxs in 7 days, this was <1 block from "suburbs"
Animals now feed off humans, especially good game animals. Deep wilderness becomes scarce for animals, and more dangerous for you. Although... I have to say much more rewarding if you can make it.
Again, very jealous, and since your in florida, do not worry winter affects you little.