Well and septic vs city water changes almost every outage decision you make, from stored gallons to generator size. Here is the fork, side by side.
A blackout does not break everything at once. Here is the real order your house fails in, with hours attached, so you fix the right thing first.
What to do first, in order of return: carbon monoxide detectors, stored water, a load audit, backup heat and a bucket toilet. Under $200 and one weekend.
A home energy audit for backup power: how to measure watts and watt-hours appliance by appliance, with a table of typical loads for a house on a well.