Go to the nearest gun store stock up on guns and ammo.
Go to Academy sports and get things that would be needed in certain struggles.
Go out to the country side, and find a walmart out there and I guess scare people out with the guns. Make a base in Wally world use the buggies and shelfs as a barricade if needed.
Use a armored bus with spikes on the side as tranportation.
Flood what is yours?