One of the biggest causes of death in a post-SHTF situation is going to be disease and pestilence and biting insects will be one of the ways they spread.
In addition to staying warm, there are a number of other concerns including colds and the flu that you need to consider if a SHTF scenario happens during the winter
Water quality is very important as you cannot afford to get sick when confronted with crisis situations. Drinking water that is riddled with bacteria can kill you.
Natural preservatives - dehydrating, fermenting, smoking and salting, and also sugar and vinegar - can come in quite handy especially when it comes to long term survival.
When SHTF, it is absolutely vital to have proper medication, considering that access to regular medicine is not always available. Even when you do have medicine, you can't tell when
