It turns out that the sweetness of sugar is actually consistent across sugars. The only thing that changes is the coarseness, or in the case of brown sugar, the use of molasses. The only sugar you should ever really need to buy is simple plain sugar!
In order to make confectioners sugar (or powdered sugar), all you need to do is run your regular granulated sugar through a blender until it has a fine, powdery consistency. Feel free to use this in yesterday’s drink recipe, or indeed any recipe that calls for confectioners sugar.
This also applies to salt, as all salt has the same salinity. The only thing that changes is the granularity. Run your kosher salt through a blender to make table salt!