Imbibing Friday-evening cocktails (especially after a week of deadlines) has become a cherished editorial practice here at the Robb Report headquarters in Malibu, Calif. And for the last couple months, a sort of simplified Manhattan has been the cocktail of choice. Late last year, the bourbon maker Woodford Reserve released its latest cocktail mix-ins: Bourbon Cherries ($16.95) and Aromatic Bitters and Sassafras and Sorghum Bitters ($16.50). And while these mix-ins will make any cocktail that calls for th…