Does 3 weeks living in an urban house (no fireplace) with no heat or power count? If so, I've done that plenty in Missouri's wicked ice storms. We had no power for 100 miles and too much ice to travel anywhere.
During the initial worst phase of it, I had many people staying with me because they were unprepared. I was able to drive on some streets or cut through grass patches in my jeep to pick them up because I had chains, but there was no fuel, candles or food to be bought regardless.
The national guard had to evacuate most of them and set up shelters for over 300,000 and the rest were left to fend for themselves or were evacuated 120 miles away to where they still had power.
For us, we still had natural gas, but of course, the heaters use electricity, so I made a routine of filling up the tub with hot water as well as large containers which were then dispersed around my house for radiant warmth. Despite the daily highs of 15F, it kept the baseline warmth in the house around 45-55F. I rigged a garden hose to a faucet and snaked the hose around the floor of the room we were using and set it to trickle and the end was snaked back to the sink so it served as a radiating heat coil (ok, this idea only worked a little, I'd have needed a much larger water heater for it to work the way I hoped).
We then made tea candle chandaliers which both lit the house and raised the temp to the lower 60s. I also used a trick I learned from an old fisherman about using a small coffee can, stuff a roll of toliet paper in it after removing the center cardboard, in a larger coffee can, add a 2" layer of sand or kitty litter (serves to keep the bottom from getting too hot and as a safety measure), place the smaller can inside the big can, add a few ounces of rubbing alcohol to the TP and light it. Have a lid handy to snuff the flame. It burns (relatively) clean until the alochol runs low, warms the house well and is easily contained. That brought the house up into the lower 70s when used.
To get those temps, we blocked off circulation to the parts of the house that were unused. We kept the water at least on a drip to prevent frozen pipes.
We had plenty of propane/isobutane fuel for my camp stoves and pretty much used whatever food we'd normally prepare on a camping trip. We even made smores.
Morale was the roughest part, the radio stations were out for the first several days and I don't have CDs. Lots of board games and a deck of cards are highly recommended. We took turns reading books aloud, we managed to get through much of the Harry Potter series if that says anything for how long the blackouts were.
We kept up with the weather on my weather channel emergency flashlight, radio, hand crank cell charger thing. It works pretty well and I have since put one in my car kit.
In the cold, candles are pretty much your more reliable way of supplying light and the double for heat. We rarely used flash lights unless we were going in the rooms we blocked off.
Fuel for the vehicles was another concern. Before the storm hit, I had a half tank of fuel in my jeep and rapidly found I was the only one in my neighborhood that had chains for a 4x4. I ended up shuttling my neighbors to the national gaurd stations and had little left for my own.
Several of my neighbors decided to try and get gas generators. They found that some rather questionable business people had bought all of the ones from home depot and were outside in the parking lot selling them for $2000 instead of the retail of $450. Some that got them home only had a couple gallons of gas and didn't have the training necessary to splice them into the electrical system so they basically blew $2000 for something to turn on a TV and a couple light bulbs, but were still in the cold. One neighbor insisted his small generator would run electric heaters, but of course as soon as it was plugged in, it would trip the breaker on the unit.
We found that we were overall more comfortable and better up to date than the people who had generators, and we didn't have to fight our way out of town and pay 5X normal cost for gas to fuel them.
Here's my photos of the last destructive that I was in (2007): Springfield Missouri's Ice Storm