I was able to get -3.7 degrees of camber in the front (by choice) and -3.5 in the rear (corrected out to -2.5) along while keeping the toe in spec, all with stock arms. So the bare minimum would be nothing.
I'm pretty sure -4 degrees is possible with stock arms. If not, offset RCAs are a cheap way to add a lot of camber in the front without changing anything else.