Based on my experience with katrina, here's what you should have.
Canned food, things you can eat without heating or water, such as tuna, spam, b'fast bars, pop tarts, dry cereal, crackers, cookies, canned fruit, dried fruit, chips, have plenty of forks, spoons and paper plates and napkins. Lots of powdered drink mixes, gatorade and water. Before the storm, you may want to fill your sinks and bathtubs with water also.
However many batteries you think you need, get two more packs. If you don't use them, you'll be able to use them later.
Baby wipes, hand sanitizer, lots of paper towels and tolilet paper. Cool hint, hand sanitizer cleans eye glasses like you wouldn't believe!
Make sure you draw out enough cash to live on for a week or two. Keep in contact with an out of town family member. keep your cell phone charging until the power goes out. You can change your cell phone setting to search for any available network, that way if your network is down, the you can get another network. If you have a chance, I would avise you to go to target and get the coleman fluorescent lantern. It was pricey, but oh so worth it. Don't forget a battery operated radio or tv. Mine was priceless after katrina.
Make sure you have prescription meds, motrin and anti diarrhea meds on hand. Cards and games are helpful to pass the time.
Honestly, if you can get out, by all means, do!! I stayed for Katrina and it was traumatizing. I still have nightmares and panic attacks. It's so not worth it.
I'll be praying for you all in the path of Wilma.