How to drink Tequila:

Tequila is consumed both neat (without other ingredients) or as part of a mixture to produce a variety of cocktails such as margaritas.
When consumed neat, tequila is served several ways. The most common is in a narrow shot glass called a caballito, which is a 2oz serving.
In 2002 an official tequila glass from the Riedel Glass Company was approved. The glass is 6-3/4 oz and is an elegant slender glass with a tall stem, meant to lift fine tequila to the level it deserves, to accord it the appreciation and respect of which it is worthy, according to Riedel.
It is popular in some regions to drink fine tequila with a side of sangrita—a sweet, sour and spicy drink typically made from orange juice, grenadine (or tomato juice) and hot chilies. Equal-sized shots of tequila and sangrita are sipped alternately, without salt or lime.
Outside Mexico, a single shot of tequila is often served with salt and a slice of lime. This is called "tequila cruda" and is sometimes referred to as "training wheels," "lick-sip-suck," or "lick-shoot-suck" (referring to the way in which the combination of ingredients is imbibed). The drinker moistens the back of their hand below the index finger (usually by licking) and pours on the salt. Then the salt is licked off the hand, the tequila is then drunk and the fruit slice is quickly bitten. It is common for groups of drinkers to do this simultaneously. Drinking tequila in this way is often erroneously called a Tequila Slammer (which is in fact a mix of tequila and carbonated drink). Though the traditional Mexican shot is straight tequila, lime is the fruit of choice when a chaser must be used. It is believed that the salt lessens the "burn" of the tequila and the sour fruit balances and enhances the flavor. In Germany and some other countries, tequila oro (gold) is often consumed with cinnamon before and slices of orange after, while tequila blanco (silver) is consumed with salt and lime. Finally, as with other popular liquors, there exist a number of shot-related drinking games and "stunt" drinks such as body shots.