Personally, where we live on Lake James in Western NC, I'd stay home. A year ago, the Lake went up 10 feet in about 11 hours. The dock floated off the moorings, the gazebo was almost under water, and I tieed the dock to trees and saved it from flowing out towards the spillway. With the ordnance and food reserves, we were prepared.
Now I understand conditions are much more severe in TX, LA, and MS. But in terms of looters... they would gain weight after some lead injections from me.
It makes sense for everyone to have on hand at all times enough food and supplies to last at least a couple of weeks.
In addition, I think every car should have at least three fourths of a tank of gas at all times. It would act as a gasoline storage reserve if everyone did it. It's like stocking up on bottled water ahead of time, rather than when the SHTF.