I think we are most dependent on electricity of all things provided externally. Water can become critical as well obviously. In theory with electricity we can pump from a well if we have such a thing. That was a huge advance for rural homes in the 1930s. My Dad was born in a house that was no different from a house in 1700, basically, in terms of having anything of any note, my Mom the same. She commented that electricity was huge for them, aside from lighting they now had running water. That house was on a cistern when I was a kid, the switched to well water later which tasted funny.
