Here's a list of stuff I think we need. Please leave a comment to add anything that I missed, and I'll edit this list to include it. Righteous.
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-Essentials-
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backpack (obviously)
tent
sleeping/mummy bag, blankets will probably do just fine since it'll be so hot
water bottles: SIGG, Nalgene, canteen, whatever
stove + fuel (Dad, Joey and Matt have)
water purifier (Dad, Joey and Matt have)
mess kit + cup/mug
utensils
biodegradable soap (I like Dr. Bronners, because you can use it as soap, toothpaste, detergent, shampoo, etc.)
waterproof matches or lighter
good sunscreen
insect repellent
flashlight(s) -- LED flashlights are light and powerful
spare batteries for flashlight
bathroom essentials: toothbrush/paste, soap, contacts + solution, hair-ties, vaseline, spare contacts, etc.
biodegradable toilet paper (apparently there's a lack of it in the facilities)
first aid kit (I know Joey has one, anyone else?)
[contents of first aid kit: bandaids (including waterproof), butterfly bandage, ace bandage, waterproof tape, acetaminophen/ibuprofen/aspirin, snake bite kit -- there's a good list
here]
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-Optional-
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camera + a good case + spare battery
disposable camera (just in case)
lotion (apparently we'll need it)
compass
poncho (black garbage bag or two would suffice--rains expected!)
CamelBak or water bladder
watch
rope
mirror
knife/pocketknife
dish scrubber
ziploc/plastic bags (good for camera protection and storing/carrying little items)
maps and field guides
carabiners to secure stuff to your pack
backpacking towel
sleeping mat
headlamp
rain cover for your pack
rain poncho
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-Clothing-
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I don't know girls' clothing that well, so this is what I'm bringing:
sunglasses
swimsuit
2 pairs shorts
2 t-shirts
maybe 1 long-sleeved shirt, but I'm not sure yet
maybe 1 pair of pajama-y pants or something, also not sure on this one
underwear
hat
sweatbands (if you're me--yes)
good shoes or foot coverings of some kind, at least two pair: for water and/or hiking (I'm just bringing Chacos and flipflops)
socks (if bringing shoes/boots)
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-Food-
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For food, lots of lightweight, filling stuff. We won't want to bring canned foods. Boxed foods are a great idea, stuff like rice-a-roni and couscous--you just take the package out of the box and save the heating directions.
We should all cover our own food entirely, but also bring maybe one or two things to share--for example I'll bring a decent dose of my favorite homemade mix that can go around.
On the first day it will probably be possible to bring certain things that won't go bad instantly. Things like:
carrots
potatoes
apples
bananas
sandwiches (like peanut butter or cold grilled cheese or something)
coffee
tea
oats
freeze-dried beans
quinoa
couscous
split peas for soup
rice-a-roni
rice (minute rice is lighter, but takes up more volume; "real" rice is heavier but low volume so you can bring a ton of it)
top ramen (eat at your own risk)
macaroni and cheese (if you so choose)
granola
granola/food bars
trail mix/gorp
dried fruit
dried bananas -- get them in bulk: strange texture, but very light, filling, and nutritious
salt/pepper
a little sugar/brown sugar (for oatmeal especially)
(There's a ton of food I haven't listed. Please suggest!)