I prepare for a 3 foot snow event and two weeks without power. So this includes stocking food and woodstove heating and cooking. In reality worst outages to date have been spring and fall with 3 and 5.5 day outages. Largest single snow event has been about 20 inches. My aim is to hunker down until the weather blows over and the roads are clear.
Fuel on hand is 40 gallons of gas in 5gal cans and 100 gallons of diesel in drums. ~250 gallons of heating oil/diesel in boiler tank.
Home power demand is light, 1-2KW average loads. Need 5KW 240V minimum for well pump. Hot water boiler only draws 300 watts.
3 Generators of different capacities:
1) 5.5KW Generac Wheelhouse, 2003 model, this is my "starter" generator. No regrets, it always starts easily and runs everything I need but the clothes dryer. This is my goto generator for unexpected/brief outages. Uses .5 gal/hour gas.
2) 2KW WEN inverter generator, 2017 model, very quiet and sips fuel. Easily runs 12 hours on one gallon of gas. Powers electronics, lights, fridge boiler at night and when I don't need 240V. I have it wired to feed the 120V circuits on both sides of the home panel.
3) Rural King 15KW PTO genetator, 2017 model, overkill for most of my needs, but it can run my electric oven, clothes dryer, and all essentials at the same time. Fuel consumption is .6 to 1.4 gal/hr depending on load.
I would not run a generator 24x7 unless temps are below freezing and I need to keep my pipes warm. In which case the small inverter generator would be run at night, remember the boiler only draws 300 watts. Also having the light circuits powered at night is handy.
I also have an RV Project with 200 watts of solar panels, 2KW inverter, and 2 golf cart batteries. This is sufficient to run my full size fridge during daylight hours when I'm away at work.
With the preps above, I was consuming about 5 gallons per day during the 5.5 day outage. 4 gals of diesel and 1 gallon of gas and was quite comfortable. During that outage I could have used the inverter gen more, and PTO gen less, thus further extending the life of my fuel stocks.
Re Water, I am considering adding a hand pump to my well, but the water tank holds pressure between generator runs for basic needs. I'll also draw off 5 gallons in a container for drinking.
During the 3 day power outage I had guests in the house. At night I turned off the valve to the toilet and we relied on collected rainwater for flushing. I was probably being too conservative, but the guests were city slickers and this was amusement for me.
I have two woodstoves, one being a 1917 Cast Iron Kitchen Stove with cook top and oven and cast iron pans and coffee percolator - an essential power outage item. The second being a larger steel catalytic woodstove, which is more useful for heating.
I've also used power outage led light bulbs and battery backed night lights to good effect to illuminate parts of the home when the AC is disconnected. Solar motion activated lights are also handy.
This all said, its kind of nice just to not have electricity for awhile and sit back and enjoy the quiet and warm glow of a woodstove and oil lamp.