“Put me in your dry dreams
or put me in your wet
If you haven't yet.”

Attributed by William Blacker (not to be confused with Valentine Blacker), who popularized the quote with his poem "Oliver's Advice" http://books.google.com/books?id=JmEaAQAAIAAJ&dq=%22Oliver%27s+Advice%22+Cromwell&q=%22Oliver%27s+Advice%22+Cromwell#v=snippet&q=%22Oliver's%20Advice%22%20Cromwell&f=false, published under the pseudonym Fitz Stewart in The Dublin University Magazine, December 1834, p. 700; where the attribution to Cromwell appears in a footnote describing a "well-authenticated anecdote" that explains the poem's title. The repeated line in Blacker's poem is "Put your trust in God, my boys, but keep your powder dry".
Attributed
Variant: Trust in God and keep your powder dry.
Variant: Put your trust in God, but keep your powder dry.

From the poem "Oliver's Advice" http://books.google.com/books?id=JmEaAQAAIAAJ&dq=%22Oliver%27s+Advice%22+Cromwell&q=%22Oliver%27s+Advice%22+Cromwell#v=snippet&q=%22Oliver's%20Advice%22%20Cromwell&f=false by William Blacker, published under the pseudonym Fitz Stewart in The Dublin University Magazine, December 1834, p. 700. This line by a different Colonel Blacker is paraphrased from an attribution to Oliver Cromwell (hence the poem's title).
Misattributed

-At the Hop
From Niño Rojo
Variant: Put me in your dry dreams
or put me in your wet
If you haven't yet.

Source: Getting Things Done: The Art of Stress-Free Productivity (2001), Chapter 1

Source: Eleven Minutes

McKenna Grace [citation needed]

A Conversation With The Legendary J.M. DeMatteis! (2004)
Context: Follow your heart, follow your dreams. If writing is your passion, put everything you have into it. Let that passion, that joy, lead you. In the end it might not lead you to exactly the place you thought you were heading... but it will absolutely lead you someplace wonderful. And don’t let the Nay-Sayers, the Practical People, stop you or wear you down. Follow your dreams... and you can’t go wrong.

Source: Magic Slays

Source: The Collector