@Jerryberry, have you ever read a book called
The Stand by Stephen King? Maybe even
The Lord of the Flies? Both books give you an idea of how quickly society can break down and in most cases it will be every one for himself. Every disaster brings out the good and the bad in people. In every disaster there are stories of neighbors helping each other and stories of thieves stealing and/or destroying stuff.
All that aside, in a true large scale disaster the food growers will not be able to produce enough without equipment to feed a large community. Some people will want to help, some people will want to be spoon fed, some people will steal food from the fields and the less than human "people" will destroy the crops just to hurt the rest of the population.
To provide enough food for a large community everyone will have to pitch in. Someone will have to be in charge and guide those who never before got their hands dirty. Someone will have to be in charge of rationing food so everybody gets enough to eat. Someone has to be in charge of bringing in water. Someone has to be in charge of rationing water.
Unfortunately our society has degraded to the point where most people demand someone take care of them. If there is ever a large scale disaster the people who can make do, will disappear and care for only themselves and the ones with them. They don't want to be shot over a bunch of carrots that the shooter has no intention of eating. You can't get people to stop killing each other over stupid crap now, it will be a million times worse if society collapses.