The task of making such a list is virtually impossible. I have a personal library of about 6000 books and can't bear the thought of throwing any of them out. But here are fifteen -- and a few more. In no particular order. They are all books that I can take off the shelf when my brain feels stale, open almost anywhere, and feel fresh again, thanks to the beautiful power of words.
Along with: anything at all by Nora Ephron; any novel by Elmore Leonard, Alan Furst, Carl Hiassen, Benjamin Black, Georges Simenon, or William Kennedy; any volume of poetry by Seamus Heaney, Derek Mahon, Paul Muldoon, Pablo Neruda, W.H. Auden, Eavan Boland; any work by Jimmy Breslin, George Orwell, W.C. Heinz, A. J. Liebling, Clive James, Octavio Paz, V.S. Pritchett, Murray Kempton, Luigi Barzini, Gay Talese or Tom Wolfe. Anything by... well, you see what I mean.

Love (Penguin Classics)
The Posthumous Memoirs of Brás Cubas (Library of Latin America)
The Collected Poems of W.B. Yeats
Invisible Cities
The Death of Artemio Cruz: A Novel (FSG Classics)
The Ginger Man
Lost Illusions (Modern Library Classics)
Treasure Island (Oxford World's Classics)
The Collected Stories of Katherine Anne Porter
At Swim-Two-Birds (Irish Literature Series)
The Sun Also Rises
The Fall
William Trevor: The Collected Stories
Dubliners (Norton Critical Edition)
This Business of Living: Diaries 1935-1950