Tequila Headache for Diageo as U.S. Drinkers Cut Back. Guinness Maker's Stock Drops. - Barron'sSkip to Main ContentThis copy is for your personal, non-commercial use only. Distribution and use of this material are governed by our Subscriber Agreement and by copyright law. For non-personal use or to order multiple copies, please contact Dow Jones Reprints at 1-800-843-0008 or visit www.djreprints.com.# Tequila Headache for Diageo as U.S. Drinkers Cut Back. The Guinness Maker's Stock Drops.By [Callum Keown]Sh ...