This is so cool! Well crafted and a very good idea! I've printed it and it's great. I must admit that I don't understand well the starving mechanism : do one of your companion die as soon as you have 0 ration?
Thanks for this very good work! 
Hi there! Thanks! So the starvation mechanism is basically once you have zero rations, you get three more "ration adjustments" until you all starve. So let's say you have no rations left, then you roll a ration check and lose two rations, that is one ration adjustment. You roll again, do a ration check, you lose 1 ration, that is your second ration adjustment. A third ration check and you lose 1 ration, that is your THIRD and final ration adjustment. You are all dead. If you had managed to get a ration during any of those turns, that "three ration adjustment" countdown would reset. If you need any more clarification just let me know! Lots of rules to fit on a business card so I had to be really terse.