Questions relating to staying alive in the wilderness and learning survival techniques. Please **do not** use this tag for questions about general survival that are not related to the outdoors. Surviving in town or city environments will likely be closed.

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What is the smallest island that will support one person indefinitely?

In the movie Cast Away with Tom Hanks the character survives 4 years on a small island. But that was a movie. It is a common cartoon image to see a single person on small island with one coconut tree,...
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Is there a portable fluoride water filter?

Is there a portable water filter product (for backpacking), like the following two... MSR AutoFlow Gravity Filter by MSR, which seems to filter relatively large volumes of water (~4 Liters) quickly (...