Challenge: Live below the poverty line on 1.50 per day.

[Retrograde]

4. My property taxes are considerably more than $1.50 a day

The additional parcel tax is even more than that, not to mention the other assessments. Just because there's no mortgage doesn't mean there's no outlay.

ETA: the original article linked to just talks about food. I suppose it's possible if you can get a group of people and pool resources so you can buy in bulk and have the facilities to prepare meals and store leftovers for reuse, and maybe have access to some no-cost garden space. But it's still a very thin budget, and allows for little to no slack - make sure you don't burn those beans if you want dinner tonight!