Your ideas are great, the one I like the most and seems to me more viable is the computer without using fingers thanks to neural connections. I imagine something like the Titans of the Pacific, but they are both cable or helmet something lighter.

Cars with water are not a bad idea, but in countries where water is hard to come by it would be a problem. Besides that water is a non-renewable resource when its use, treatment, release, circulation is not carefully controlled and I am sure that then they would sell us the water very expensive because that's how the degenerates who seize the wealth and resources are.