The trick becomes keeping it warm- alcohol chills much more quickly than water does, but if you aren't using it for long and can keep it off the ground, it helps in the 0-to-32 degree range. Part of the problem is that below freezing, the water it's absorbed out the of the air wants to be a solid, so you want your stove to be at least 40 degrees (also has better vaporization of the fuel that way).
One of the things I like to use is a small "stove" made from a coffee can that has been opened at both eneds. Two sets of ventilation holes just above/below the start of the ribs, and four small holes in the middle groove. Two pieces of bent coat hanger wire that can be slid though the middle holes or either set of air holes pretty much completes the system. With the trangia, I put the wires in the middle possition, and place the stove on top of them, with a pot/cup at the end- it has a nice chimney action, and once the coffee can is warm, it will warm the air so you can get the trangia roaring.
Add the top off a small can if you want to use ebsit or triox in the stove, and balance it on the cross wires at the top set of vent holes. Or burn small wood in it- nice small fire, easy to clean up after, but still pretty hot. I often use this is if I want to conserve fuel, but don't want a big fire over night in the summer, becuase you end up with about a 4" diameter fire scar and maybe a cup of ashes to cover up.
I actually pack two sets of cross wires, becuase an olicamp cup for a nalgene bottle fits into a standard sized coffee can very snuggly, so if you put the trangia on the bottom set of vent holes and the bottom of the cup at the top set, you will have boiling tea water pretty quick, particularly if you hung onto the bottom of the coffee can, as it makes a pretty good lid for the cup.
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-IronRaven
When a man dare not speak without malice for fear of giving insult, that is when truth starts to die. Truth is the truest freedom.