re: Camping in single digit temps

Muy layers, no cotton anything, drink plenty of liquids. Closer fitting cloths for base layer and looser stuff for outer wear. For coffee, hot chocolate, and oatmeal throw in a splash of Baileys Irish Cream. With hot spiced cider a little brandy. Keep alcohol to a minimum. Sleep with your water filter in a double zip-lock. Keep at least your morning base layer pushed down in the foot box of sleeping bag, along with water bottle. If car camping a Coleman lantern will knock the cold off a freezing tent in 5-10 minutes before undressing. A good insulated cup/mug is your friend. A small square of insulated foam works wonders for sitting in the snow. F' the jet boil (canister stoves) get an old school gas burner. And enjoy having fresh food that you can defrost instead of dehydrated bag fare.