Thats an interesting question. The thing is, I assume youll be able to re-stock at some point, although I wouldnt hazard a guess where. But lets run some numbers. Most DEET repellents with 30- to 50-percent DEET advise the user to re-apply every eight to 12 hours, depending on the formulation (waterproof" repellents last longer). So lets say youre wearing a permethrin-integrated short-sleeve shirt and convertible pants with the lower part zipped off. You put DEET repellent on your arms, legs, neck, and face. My guess is youd go through about four fluid ounces per week (120 milliliters) of a lotion-type repellent. Maybe a bit less. That comes out to a little less than a half-liter per month, which sounds about right to me.
As for clothing, makers of insect-repellent clothing, such as Ex-Officio (exofficio.com) here in the United States, say that their stuff is good for 25 washings. In four months you might go through a wash per week, so youd be about rightparticularly if you take a change or two, which I assume you will. You might carry some spray-on repellent for your clothing, just in case. I suggest lotion for your skin as there will be less waste so you wont need as much.
One repellent net should be fine, with a spare in case you lose yours or its damaged.
Id sure check this beta against someone whos been in the areas where you plan to travel. Find an online chat site or something and pose the question. But I think my estimates should give you a good start.
The Gear Guy reports from 2007 Winter Outdoor Retailer, the bi-annual gearapalooza in Salt Lake City. Check out his top picks for gear to watch in 2007.