Wow, sounds like there's a bunch of different brew events in Tampa on Saturday! I wish I could make it to all of them!
I know there will definitely be homebrew samples at the Southern Brewing event... They have a bunch of beers on tap in their little serving room. I plan on bringing my portable kegerator as well with an IPA.
As far as the logistics of getting equipment there, thankfully I can fit everything I need in my small SUV (or at least I did last year). Yes, you definitely need to bring your own water, they will have hoses around for immersion chillers but obviously you won't be able to get toooo chilled in this heat. I'm brewing an Octoberfest lager, so I'll chill it as low as I can there and then bring it home and finish the chill in my fermentation fridge. Not ideal but it works.