I think you need to look at the NOAA National Hurricane Center Website closely as we move into this weekend. It is as precise and as accurate as you can get. Hurricane Irma is not 500 miles wide. Hurricane strength winds are about 120 miles wide (roughly as wide as from Pensacola to Panama City) and tropical storm winds (39 mph) are as wide as from Pensacola to Tallahassee. It will impact most of the Florida Peninsula, but we really won't know until about Sunday evening if the panhandle will get much impact. We will still be two or three days from feeling any winds at that point. Again, look at the National Hurricane Center cone of uncertainty. That is not the width of the hurricane. The smaller brown circle is the width of the hurricane.
I think everybody should get a full tank of gas, no question about that, but try to use a little logic about buying water. Maybe a case of water is prudent. But you only need to stock up on lots of water, if you are planning to stay, and ride it out. If you are planning to ride it out, you are stupid. I would suggest spending your time collecting your valuables into very secure, safe places, backing up your photos and documents onto portable hard drives, to take with you, and stuff like that.
I am leaving at precisely 7:21am on Monday , so I want none of ya to leave at that same time. OK? Or was it Sunday...