Orange water is distilled from orange blossoms. Orange water adds a hint of flavor and an intense aroma to any pairing.
Why in the world would anyone want to put something called "Bitters" into a drink? In fact, Bitters are critical in the best drinks. The first publication of a bartenders' guide which included cocktail recipes was in 1862 - How to Mix Drinks; The Bon Vivant's Companion, by "Professor" Jerry Thomas. In addition to recipes for Punches, Sours, Slings, and the like, were 10 recipes for drinks called "Cocktails".
A key ingredient that differentiated cocktails from other drinks was the use of Bitters.