I have never been a fan of alcohols stoves, even the best I have seen, a commercial pressurized unit fed the best fuel, had a pretty poor energy output compared to white gas. They also seem get weaker and finickier as conditions get worse. Usually when you most need them. I have seen a nice home made unit, which in good conditions boiled a quart of water in about eight minutes struggle to heat a cup of water at 35F in a misting rain and relentless wind. When we were borderline hypothermic and really could have used something hot to drink.
A similar situation with my old Svea 123 running white gas had it roaring like a jet engine and boiling water as fast as we could drink it.
The best thing I can say about alcohol stoves is that it will run, at least nominally, on easily available stuff like rubbing alcohol and the alcohol stove is a step up from the Triox and Hexamine solid fuel units which seem entirely suitable for heating up a GI canteen cup of instant coffee. As long as it isn't raining or blowing too hard.
Something that came up earlier in the thread that I think should be discussed more: carbon monoxide.
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Combustion products should to be vented DIRECTLY outside. Even being in the flow from the source to the outlet will allow CO to accumulate in your blood.
I think anyone considering a bug-in situation should plan on having the stove/whatever outside, somewhere that airflow can't carry the CO inside.
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Edit: I recognize that most of the people posting here have experience and knowledge of this. I'm posting for the people who might be lurking, and are new to all of this. 
While consideration should be given to ventilation and safety there also has to be recognition that CO in small amounts is a normal product of most combustion and in small amounts it is fairly well tolerated. It doesn't pose a major risk as long as common sense precautions are taken. If it wasn't smokers would be keeling over right and left.
The single burner propane stove puts out less CO than the four burner propane or natural gas stoves you find installed in many homes. Home appliance which are not vented outside.
Gasoline and kerosene stoves are IMO far worse at producing CO than propane or alcohol. Combined with their tendency to sometimes flare up I generally refuse to use them inside. In fact the reason I got the propane stove was because it was much more suitable for interior use.
T_Y :
I'm unclear what you're actually looking to discuss.
My understanding is that CANOEDOGS is considering a special situation based on a worse case corruption of his favorite outdoors activities. He is considering what might happen if he was canoeing a remote area and for some reason, like a sudden change in the weather, he was dumped in the cold water and barely makes it to a wet and windswept shore with only whatever he has in his life jacket/survival vest. It is something of a singular predicament limited to whitewater rafters, offshore kayakers, and wilderness paddlers. One which most people will never face. But it is an interesting thought experiment.
Just brainstorming here but I would start with something that would provide heat fast, something that would work even after dunking and in strong winds and water spray. Something compact and relatively light, so it would fit in a vest. I'm thinking something like a flare would be a good start. Remove and flip cap and strike and you have a very hot fire that wind and rain won't touch. Burn time of ten minutes. So climb into a plastic bag and squat over the fire. After seven or eight minutes your warmed up enough to function and seek better shelter.
Follow, once in better shelter, with something light and compact like one of the smaller multi-wick candles. They won't allow you to do much actual cooking but you can heat up coffee, tea and broths.
On the other hand as a spelunker, often wading and swimming through cold water and risking hypothermia, stuffing myself into a garbage bag and squatting over a small fire, often a candle or carbide headlamp, is standard warming procedure.
In fact the more I think about it a carbide headlamp might be a good choice for CANOEDOGS. The lamp is compact and light brass unit that can be left unfilled. Activation is a matter of dumping an ounce of calcium carbide into the bottom and spitting a little water into the top. Water drips on the carbide producing acetylene gas. This comes out of an orifice under pressure and a spark igniter lights it. Producing a small white-hot flame that resists wind and rain.
Biggest issue is that the compact carbide headlamps are antiques. I have one made in the early 70s, a brass Premier unit that still kicks but those haven't been made for some time. I have carried a small carbide supply in wet caves without any issues but carbide is harder to get than it used to be and inexperienced users can face issues.
A flare and a multi-wick candle in a can are much more familiar and might conceivably serve.
There again one of those tiny and light Trangia alcohol stoves and six ounces of methanol might be better if your willing to overlook and work around the down side of alcohol I mentioned earlier.