Add 2 ounces of good quality Gin, and 4 to 5 ounces of tonic water.
Lightly squeeze one wedge of lime into the glass before dropping it in.
Gently stir and serve.
Notes
Classic Gin and Tonic is usually served in a Highball Glass, or a Rocks Glass. I thought these juice glasses were really fun, and close enough to a rocks glass, LOL
To adjust the strength of your cocktail, simply add more or less tonic water. Taller glass, more room for tonic water.
The quality of your gin and your tonic water WILL have a direct affect on the taste of your drink. You don't want to skimp, don't buy generic.