I wonder about things like that too
I don't think we're supposed to lol. Remember last season when Ollie and Big Jim fought for possession of Ollie's well after the water tower was destroyed and they discovered the water in the lake was polluted? And then Barbie blew up the well so that two other wells would work? I think we're supposed to assume they figured out how to pump the water from the wells into the main water lines. If not, we'd see residents carrying lots of buckets to and from the wells. I've vacationed in a couple places that had wells and we had to pump water into a bucket to take to the cabin. The cabins didn't have indoor plumbing so we had to go potty in an outhouse. I guess since Chester Mills' homes have indoor plumbing, they could pour a bucket of water into the toilet every time they needed to flush
I don't remember where all the propane powered generators came from. I remember Ben had a generator because he charged everyone's phones. Our generator is diesel powered so we'd be out of luck if a dome cut off our power lines