Walden
by Henry David Thoreau
One of the progenitors of HermitLit, Thoreau's account of living self-reliantly at the side of a pond includes pages listing his supplies and expenses.
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You may not actually read this book, but its utility will become apparent should you decide to never return home.
The Sheltering Sky
by Paul Bowles
When a Manhattan couple heads to Northern Africa to repair their relationship, the wife has an affair with a mutual friend. The tragic conclusion--in which the husband falls seriously ill and his wife goes native with a caravan of nomads--is either depressing or a relief, depending on your own marital status.
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The Water In Between
by Kevin Patterson
The British Columbian's sailing memoir tells of a voyage into isolation prompted by the most classic motive of all time: love gone sour. After a nasty dumping, Patterson heads off into the Pacific, at one point going 31 days alone at sea. You should be fine for a week.