[header] How to make whiskey ice balls [title] Understand what you're going to be doing. [step] There are two important factors to produce clear ice: water quality and freezing method. [substeps] Water has trapped gas particles and impurities in it that lead to that cloudy appearance. 
Removing the gases and impurities is the first step to achieving clear ice; therefore pure, distilled water is needed. The second crucial step to achieving clear ice is the freezing method.