depends on if I knew I was going to be stranded or not. I usually carry a pentax k1000 when I'm out and about loaded with FP4+ to be processed as slides. I'd have that if I was suddenly stranded.
If I was going in to exile, I'd probably want to take a 5x7 Shen Hao loaded with FP4+ or HP5+ (again, to be processed as slides and contact printed on to positive paper). I dont have the shen hao yet, but I'm saving up for one, so I'd like a little bit of notice before being shipped off so I can get some money together