The problem is, we as a civilization are no longer set up to live without those things. Before air conditioning, windows in office buildings could be opened and there were fans everywhere. The fans are gone and the windows don't open now. People live in apartments way too far up to be practical if you have to take the stairs. Nearly nobody has a well and bucket anymore, so yes, we depend on water pumps. In theory, we could, given time, adapt to do without (+/- having centers of population too dense for that) but 24 hours really isn't enough notice.