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32 Things You'll Totally Need When You Go Camping. Propane coffee maker
Datrex Emergency Water Packet - my husband and I each have a supply of these in our vehicle bug-out bags, along with a stainless steel water bottel. The bags that hold this water don't break down like plastic water bottles will do in your trunk.
The SteriPEN is a portable UV lamp that purifies any water after just a few stirs.