I'll try to recall SOME of the verse(s). Note that the Kingston Trio spoke the verse, but the song may have had a melody for the verse and may not have. Ellipses (...) indicate gaps in my memory. Here goes:

"I was ... under a hot, blistering sun ...
And I couldn't believe my eyes when I saw that water pump ...
The note said, "Have faith, my friend, there's water down below.
You've got to give before you get - I'm the one who ought to know!

(You've got to) PRIME THE PUMP, YOU MUST HAVE FAITH AND BELIEVE
(You've got to) GIVE OF YOURSELF 'FORE YOU'RE WORTHY TO RECEIVE.
DRINK ALL THE WATER YOU CAN HOLD, WASH YOUR FACE, COOL YOUR FEET!
BUT LEAVE THE BOTTLE FULL FOR OTHERS. - THANK YOU KINDLY - DESERT PETE.

... and I heard a beautiful sound
Of water bubblin' an' splashin' fro' outa that hole in the ground.
... and I drank my fill of that cool, refreshing treat.
I thank the Lord, and I thank the pump, and I thank ol' Desert Pete!

(You've got to) etc."

Great song!

HTML line breaks added. --JoeClone, 30-Mar-03.