You have the health and stamina of a human in whatever athletic condition you are in. There are no traps or hazards on the map, so other than starvation or dehydration (which won't kill you if you use the supply stores), the only way to die is to be killed. Or commit suicide, but I'm hoping none of you will do that. The nano virus is lethal but will not be used to kill a player unless that player wants to die.

The method of killing is entirely up to the players. I'm not sure what restrictions will be placed on kills (no silent backstabbings, for example), but the death is final and cannot be taken back. Granted, it'll be a problem for players who get heavily involved, but then again that's how a survival game should work. Players can RP two people if they want to increase their chances, but ultimately should be aware that they may die and be prepared to accept that possibility. Hopefully this will help keep the thread from dying of age, as RPs tend to go until people lose interest, and any player who loses interest (or becomes too busy elsewhere to invest in the RP) can leave it without harming the story.

As for who survives encounters, I encourage players to PM as necessary to decide on death. Remember that each person is after only one other person, so no showdowns will occur until the very end. As the GM, I can choose to warn or restrict players at will, so if I want to get a fight started or drag one out, I can do so through text and threat of death. From example, I could tell Player 1 that they now have to kill their target in one day or they will die, then tell Player 2 that the player "hunting" them is nearby. Standoff between players can and will occur, but I can heavily influence the outcome. I'll PM players who are nearing an encounter to ask who they want to survive and will work from there.