Your comment about a solar panel and battery reminds me of my van with solar panel and 100ahr lead acid battery and a 2000W inverter.

Things I've done with it. Run a Engel Cooler. Run a microwave. Boil water. Probably 1-2 gallons a day. Charge batteries for power tools. Run a skill saw. Power lights indefinitely.

With just that you're getting close to a middle class lifestyle.