<p>The Dry Creek Middle School drinking fountain has sprung a leak, so principal Walter Russ dashes off a request to Flowing Waters Fountains, Etc.<P>...We need a new drinking fountain. Please send a catalog.<P>Designer Flo Waters responds:<P>"I'd be delighted...but please understand that all of my fountains are custom-made."<P>Soon the fountain project takes on a life of its own, one chronicled in letters, postcards, memos, transcripts, and official documents. The school board president is up in arms. So is Dee Eel, of the water-supply company. A scandal is brewing, and Mr. Sam N.'s fifth grade class is turning up a host of hilarious secrets buried deep beneath the fountain.</p>