Rather than use isopropyl alcohol, use a Trangia or Tatonka Alcohol Stove burner with some commercial
Bio-ethanol. A Trangia Triangle is also reasonably lightweight and provides a good windscreen and support for a Trangia or Tatonka alcohol burner.
http://www.youtube.com/watch?v=CLiRg2_zBtkTo improve efficiency use something like a Primus EtaPower Pot with the built in heat exchanger on the base of the pan. I use a Vango PowerEx Kettle and will improve fuel usage by about 30% and reduce boil time considerably.
I can also use the Trangia Triangle with Gelled Bio-ethanol by replacing the Trangia burner with a cleaned out aluminium dessert can from a French RCIR ration pack (weighs around 5 grams). It is a perfect fit to act as a burner using gelled bio-ethanol such as Firedragon or Vango F4 fuel. This setup will boil 500ml of Cold water in around 4 1/2 minutes.