Combine simple syrup, syrup from the cherry jar, water, and bitters to a rocks glass and stir. Add ice, stir again.
Add the whiskey or bourbon and stir again for about 10-15 seconds. Slide the orange peel into the glass and garnish with a cocktail cherry or two. I use a vegetable peeler to quickly get a good, thin orange peel, but you can use a knife as well.