Plain water

Freshwater or plain water is any commonly occurring liquid or frozen water including low concentrations of dissolved salts and other total dissolved solids. The three main sources of plain water are surface water, groundwater, and rainwater.

Freshwater is not always drinkable water, water safe to drink by humans. Much of the earth's fresh water (on the surface and groundwater) is to a considerable degree inappropriate for human consumption without some treatment.

Freshwater can easily become polluted by human activities or by naturally occurring processes, such as erosion. Many cocktails use plain water because it gives the drink a texture you don't get from hard water, a sort of silkiness and velvetiness.

Plain water is also great with

Old Fashioned
3 minutes
Old Fashioned

The old fashioned is a cocktail made by muddling sugar with bitters and water, adding whiskey or bourbon, and garnishing with orange slice and a cocktail cherry. It is traditionally served in an old fashioned glass, which predated the cocktail. Developed during the 19th century (around 1806) and given its name in the 1880s, it is an IBA Official Cocktail.