Garrett,

Take a look at this article. It discusses iodine tincture as a method. I use Polar Pure (solid iodine crystals) method and have no difficulty with that. I can see no reason that tincture of iodine would not be equally effective. Cheaper too. Only drawback is carrying a bottle of liquid which is why I like the Polar Pure crystals, you just make a saturated water solution when needed.

http://www.high-altitude-medicine.com/water.html#chemical