Okay, two more things to get out of the way.
1. How do we want to solve the food and water problem? Do we want to deal with that every morning and night (there will be a day and night cycle) or do we want our packs to have food readily available for us? (in the case of the former, the mountain will generally have plenty of edible plants/animals/other things, so if you want to show off your mad cooking skills... )
2. Do we want our characters to already know each other when they arrive, or do we want them to get to know each other over time? Your character is named after you and has the same skills as you, but personality-wise you can do what you want with them.