I live in FL, and one preparation step is to locate your evacuation zone, and route - along with alternate routes. In some cases, all you have to do is move a block or two to escape from a zone A (will definitely flood with heavy rainfall) to a zone F - in the least danger of flooding. When Floyd was heading our way, our next door neighbors made the mistake of evacuating to Tifton, GA. Or at least that was their plan. They got stuck on the road for hours, and just refilled and headed back after the storm passed (it actually made landfall in Charleston, SC.) They didn't need to be on the road at all, but there are people who MUST evacuate to save their lives so please let them go first.
It will be a terrible, frightening experience to ride out the storm, but unless a tornado hits my house, I'll survive. I have maximum homeowners insurance ($$$$) and flood insurance, even though I'm not on a flood plain. I have a generator and 3 cars - my old van is our back-up car for moving large items, and the tank is filled and is our back-up gas supply. Along with gas containers in the garage. I also have an old-fashioned siphon in my hurricane supplies. I am as well prepared as I can be, but know that I've missed something. Last time I didn't have enough air freshener and fly strips, so I now have a good supply.
I don't understand people who have no drinking water the day after the storm hits - unless their home has been flooded or destroyed. People, everyone in FL should know it's coming by now. For the next week, instead of tossing that empty soda or milk container, save the cap, scrub it out really well, and put it aside. If the storm is definitely headed your way, start filling all of those containers and put them in a high place. Freeze some of them to fill any gaps in your freezer, so you can use it as a cooler for a couple of days. If you have a tub, fill it with water to use for flushing toilets.
Every news website has a Hurricane preparedness list - read it and prepare as best as you can. As mentioned, start now - or yesterday, as many did! If you don't use the supplies this time, save them for next time.