Black should be ok for a camelback, but just as long as you're not wearing olive drab clothes or cammo clothing, or have a bunch of LBV web gear hanging off of you. It's the middle of summer there right now, so make sure you keep hydrated, however you do it. Also, a big fat yes on the water filter. Giardia (or however you spell it) sucks big time (ask me how I know <img src="/images/graemlins/shocked.gif" alt="" />). You shouldn't have to use it too much if you are working with a group that does a lot of this kind of stuff. If they don't have a base camp set up with a filtering system in place, then they should at least be boiling the water for everyone and have a few jugs of drinkable water for you to fill up on. If the people organizing this trip just expect you to drink the regular tap, ask for it to be boiled, and if that's not posible then filter it yourself. It's just cheap insureance.

Bring plenty of bug juice and some netting to sleep under. Impact resistant clear and shaded eye protection is highly recomended for construction (ones that won't slip off while working/being active). Sun block. Pepto pills. Flashlights are a must. Keep your passport on you at all times (except maybe while showering) not in your backpack, but on your body, like in a waist pouch under your clothes. And have a copy or two in a safe place.

God bless you, and have fun!

-Jeff