There is a rule in this column, worn smooth from overuse by now, and no apology is coming: you cannot type the word "Willis" in the state of Texas without also typing the words Willis water. Call it a tax. Call it truth in advertising. The tap in this town does not shut off, and this week it's Houston's turn to hold out a cup. Fifty-two miles down Interstate 45 from TDECU Stadium — past the pines, past the Conroe exits, past every reason a recruiting coordinator would have to know this zip code — sits one of the quietest talent factories in Texas. A town of roughly 7,000 people that keeps…