Chilled mineral water (Mizuwari) or sparkling water (Highball)
Johnnie Walker Black Label
0 units of alcohol per serve
Fill a (thin) highball with very cold ice, ideally large cubes to reduce the surface area.
Stir until the glass is very cold, then strain off the excess water
Add the whisky and stir (some say 13 ½ times, clockwise)
Add more ice if needed, top with the water and stir (another 3 ½ times)