In an all-out breakdown of society 50%-70% of the US population would be dead in ~90-120 days.

1. Lack of clean water would be the number one killer
2. Everyone on daily medication would be next

Lots of people would die just because of all the dead people. Who's going to police the bodies?

After that your locale and access to resources might start to play a factor in your survival.

I can walk on water.......................but I do stagger a bit on alcohol.