Stealing ice from a motel is doable but not as practical as you might want to believe. To get ice on a regluar basis, it implies that you're usually near enough to a motel where it's easy to walk in and load up. That's just not every city you're going to be in. If the theftable motel isn't near where you usually are, then it costs gas to get there, and gas is not free.
I never drive in to steal ice. I'm too paranoid that the one time in the universe that anyone would care about such a worthless commodity (frozen water), they'd take my license plate number and vehicle description. I'd be more willing to do it if I was driving through an area and not planning to stay there. In cities where I live, I'll walk off the street with 4 plastic grocery bags, doubled up into 2 bags. Fill up quickly but not weirdly, walk off the property to my car parked a few blocks away. Theoretically someone could chase after me, but I could drop the worthless ice and not go back to my car, until the coast is clear. In the real world nobody's gonna know or likely care.
Creating ice on demand, is one of the gadgets I'd like to invent but have been stymied in all efforts to date. For my food I've just kept paying the ice tax, although I've got some tricks for stretching it. One is that you don't have to dump just because the ice is melted. Cold water is still a refrigerant, wait until it warms up some. Not too much though because if you're protecting spoilables you don't want any bacterial problems.
For AC I say it's solving the wrong problem. Leave the geographic area. In the summer I go up, to Asheville in the mountains. My car has AC but it's old and needs R12, which cannot be cheaply obtained in the USA anymore. I have done without. We live and die by shade. Dry climates are like magic, it can be hot in the sun and completey cool in the shade.