It means you have some sort of either self-sufficiency or direct production for use coming from where you live.

Yes, you do need to own land for this. There are parts of the country where a prole working full-time can build up enough savings in a few years to buy a house and/or land. For every place that's not an ultra-expensive city, two proles sharing a 2br and working full-time can do this.

Ideally one would want just land, less than an hour's bike ride from a reasonable-sized town, and to build structures on it- perhaps one conspicuous unit and many inconspicuous units.