You contonue to make a mundane point because you don't know where they cold get the supplies to chopper in.
That's the point, blessed....saying this slowly....IF there had been a plan in place....food and water would have been planned to be brought in...days ago.
N.O. is not an island.
Airplanes from other areas can bring in water....other methods of transportation from where the planes are able to land can disseminate water.
Repeating:
Helicopters can drop water and food...they do this in other disasters. Someone can live for a period of time on just water....without it, they die. Very simple.