PHOTO: PATRICK TEHAN - MERCURY NEWS Terry Walter, 18, at the Campbell Coffee Roasting Co., sips her fourth cup of coffee for the day. [960317 LO 5B] 5BMO 3/17 DRINK 25p6x3i PHOTO BY PATRICK TEHAN 3/14/96 Terry Walter, 18, drinks coffee at the Campbell Roasting Co. in Campbell. Walter says she drinks several cups a day, something many teenagers these days are doing.