Humans exist before a government enters the equation and imposes itself. Therefore the argument lies with Statists to prove government, not us to prove no government. When people exist, they have the best claim to their body; as they bear costs such as feeding it goes and upholding its health and existence, they have a better claim to its ownership than another thing or person. Therefore we have to autonomously act without opposition. If I initiate a violation of the rights of another, I may respond with sufficient force to claim my property back (keep myself alive). Ownership implies the right to exclude others. If I find unowned resources, I may mix my labor to then own it, seeing as how I have a better claim to its ownership than any late comer. If I use this body to work for a wage and work under conditions an employer provides; I may do so.
This is the best I have come up with in having taken some Locke, Rawls, Nozick, and Hoppe studying. It claims self ownership, no rulers to initiate force, lets murderers justly pay, and the ability to settle property disputes when the owner is likely more so than any other.