I did not think about it in such details, but now, having estimated, it turns out that I will survive. It is only necessary to add several antibiotics and painkillers to the supply. You also need a weapon, you are not the only one who wants to survive, and it may turn out that for someone you are a means of survival. And so, at home there is always a supply of water, at least 30-50 liters, there are various cereals and other food that can be stored for a long time.