>>1094612>>1094610Then seems like you will need to buy a decent amount of gear. Things you should look at, good pair of boots (lowa, asolo, salomon, la sportiva) since the trails down there may be kinda rough, decent backpack - osprey, vaude, berghaus, deuter - pick your poison. 60/70 is more than enough (I have done 2 week hikes with 40L backpack but the weather was warm, I didn't pack a sleeping system other than sleeping bag and had access to plenty of food along the way)
Sleeping bag, buy one that fits the weather. Look at confort temperature, weight/volume and since rain is a possibility maybe you're better suited with synthetic rather than down insulation.
Look at sleeping pads and try to figure /out/ what fits your comfort, price and weight needs.
Get a stove - msr (goat), jetboil, alcohol stove... many options there. An headlamp is a must too - petzl, black diamond, look it up. Get a decent hardshell, SOCKS, personally you can cheap it on pants, there are lots of options if you want something nice - arcteryx, fjallraven, patagonia and so on.
The best thing you can do is talk with your buddy, if he's an experienced guy he can hook you up with all info you need, maybe even borrow some gear from him. Honestly, if this is an one trip deal thing you don't need to spend a shitton of money, even if money is not a concern. Humm, forget what I have just said, buy has much as possible and don't forget to sell it on ebay half the price in a couple months time. Joking, obviously.
Get a water filter too. And wait, more people will probably show up and give you their 2cent advice. Have a nice trip
Also buy a knoife to baton and chop chop.