There is no clean or easy answer for living as a NEET short of inheriting a nice sum from one's parents, or living in very well off socialist country like Sweden.
For most, the best bet is to minimize the amount of wage slavery you have to do in order to survive, while being extremely frugal with what money you do have. Living out of a car, shitting in bushes, sponge bathing in gas stations. Charging your phone at libraries and using the wifi there. I suppose WWOOFing is also an option, now that I think back on it. Something you might consider looking into if you do not hate the outdoors, and live in the right area.
There are of course other methods, such as using medical tweezers and perfecting the art of the pickpocket, using the darknet for various "business practices," and the like. Obviously, I cannot say much specifically due to forum guidelines, but if you are clever you will find loopholes that you can exploit in order to survive in this world without becoming a slave.
For instance, think about how many houses are abandoned whenever there is a natural catastrophe such as a hurricane or wildfire. How much might be left behind.
Little things like this...there are plenty of ways to hack reality, find loopholes, and take advantage in order to survive without becoming a slave. You just need to be clever and aware. Otherwise you'll be killed prematurely, or worse, be imprisoned.