Boredom is also a real concern so bring the ultimate survival tool... a deck of cards.
No matter where you are in the world, as soon as you start a game of solitaire someone is bound to come up and let you know you can play your black 6 on that red 7 over there.
The condoms mentioned above are also really practical. Hospital delivery rooms see huge spikes in births 40 weeks after power outages.
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"Teach a man to reason, and he'll think for a lifetime"
~P^2
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