there are three ways i know of to answer the question of anarchist survival in the current system:
a) exist on the detritus of society - this is commonly known (however fairly) as the CrimethInc model. dumpster dive for food and other stuff, squat for housing.
b) try to live your principles through your work. this is the NGO/nonprofit/working for yourself option, and assumes that your principles can be adequately represented through a job.
c) divorce your principles from your survival tactics. accept that anything that exists in capitalism cannot be liberatory in structure, and that your principles include destroying the thing that allows you to survive in the system (this could be called the greek option, since this seems to be the prevailing attitude there).