A dirty bomb or gas attack would make it very difficult to get supplies to the right place. If you are 'near' an attack zone, and stay inside your house, you m

A dirty bomb or gas attack would make it very difficult to get supplies to the right place. If you are 'near' an attack zone, and stay inside your house, you may be able to safeguard yourself from most of the radiation or gas or whatever. But the area may be too unsafe for other people to regularly travel to, in which case water/food will be a problem. It may take a few days for the gov. to get people geared up to travel in 'somewhat dangerous zones' around the attack with food/water etc..