Pour in the whiskey and tonic water. Give it a gentle stir.
Garnish with a squeezed lemon wedge and serve immediately.
Notes
Use good-quality ingredients: A good-quality whiskey and tonic water will make a big difference in the flavor of your drink. So choose the best you can for maximum flavor results.Measure accurately: Use a jigger or a measuring cup to measure your ingredients accurately. A precise measurement can make a big difference in the balance and flavor of your cocktail.Chill the ingredients before mixing: Chill the whiskey and tonic water before making your cocktail. This will help to keep the drink cool and refreshing for longer.Drink responsibly: A whiskey tonic is a relatively light drink. If you make it with 80-proof Irish whiskey and pour the full 6 ounces of tonic, it has an alcohol content of just 9 percent ABV (18 proof), which makes it lighter than a glass of wine.