...I don't accept that I've been fed by others. I start from the individual and build a consistent moral framework from that. Voluntary exchange does not enslave anyone. Absent any other human being, an individual is still going to have to work in order to produce the necessary requirements for survival. Work will always have to be done, until we acquire the means, as someone else mentioned elsewhere, to literally create out of whole cloth those things that individuals require to survive. Once scarce resources are no longer scarce (though whether that could actually occur is a matter of debate), then ownership becomes meaningless.
However, until that time occurs and technology progress to the point of replicators able to grant us materials at will, scarce resources must be accounted for, and since no one will have access to everything at any given time, voluntary exchanges between individuals for resources that one party desires and the other party has in abundance will occur. Money facilitates that exchange, making it easier for wants to coincide and people to raise their standard of living.
I dunno if you realize this, but voluntary exchanges only happen when both parties expect to benefit from it. Unless force and coercion are used, individuals will not exchange anything, including their time, for anything else unless they stand to benefit from it.