My point is that the norm for folks living in the developed world on Earth is for their food, water, and housing to be obtained via a very technologically advanced and typically world spanning industrial supply chain. The amount of effort and technology that goes into something as simple as buying a single hammer at the hardware store or turning on the faucet and getting fresh drinking water is stunning. The difference between what's required to support a Martian civilization and an Earth civilization is not so much a difference in fundamentals as it is merely a difference in degree. And possibly it's less of a difference between, say, living in New York city today and living on Mars in 2030 than NYC today vs. NYC in 1800.
As far as water, the largest deposits of H2O on Mars are near the poles but it exists in enormous quantities at nearly every location on Mars a few meters below the surface.
As far as water, the largest deposits of H2O on Mars are near the poles but it exists in enormous quantities at nearly every location on Mars a few meters below the surface.