Re; Fire paste, please keep the tube in a sealed plastic bag. It can develop a leak and you can find flammable goo all over your "contingency" gear. Ask me how I know this.
"3 hours without shelter and or fire" in an exposed environment, "cold and wet" you can die from hypothermia. Many variables; clothing, general condition, have you eaten, are you hydrated, wind chill, etc. 3 hours, not engraved in stone, it can happen much quicker, or take longer. It comes on insidiously, the first thing to change is your mentation, then your dexterity. You will shiver until you run out of calories (use up your glycogen), and as your core temperature drops, you get sleepy. "If I could just take a nap... Kills more people then any other cause. In fact if you ever talk to SAR folks, they will tell you that whenever they find someone, what ever their other problems might be, they are always cold, dehydrated and hypocaloric (freeking hungry)
