all you would do, is grind up whole, shelled peanuts. unsalted. no sugar added.
natty peanut butter is nothing but peanuts, and sometimes a little salt.
are there any organic stores around you? there's one here that doesn't have premade natty PB, but they have a peanut grinder. you just bring in your own jar, they pre-weigh it, then you fill it and the weigh again, subtract difference, and charge you for that amount.
you need a pretty good food processor to get it puree'd enough at home.
and when it is ground, stir it up a bit to mix the oil into the ground nuts.