I am stating based on simple logic that you can’t have exclusive use of land in an inelastic scarcity market without an obligation to those being excluded if you intend to uphold the fundamental tenet of libertarianism - the absolute right of self-ownership.
So you can own that which pre-exists human labor but only with an obligation to not economically disadvantage those you excluded. The appearance of economic rent determines whether or not the condition has been met.
Food is a “good” provided by labor. A certain drug is the product of someone’s labor. To require it be given to sustain someone’s life would be creating a positive liberty framework. “Land” is not a “good” produced by human labor that is required to continue existing. To exist is to occupy a specific location in time space - they can not be separated.
No. Land is not a “necessity” to live like sustenance. To be a live as a human IS TO occupy land somewhere. They are not the same and can not be separated.
Yes. See above.
In economic parlance the term “land” is used to describe everything in the material universe that pre-exists human labor. So water is a free good that we all have an individual equal access opportunity right to access/use so long as in our use we do not infringe on the equal access opportunity right of any other individual. Air is similar.
Water and air are a little bit of a different argument because you can exist for a short period of time without them so they can be separated. Not occupying a location while existing is not physically possible.