Vodka

Vodka is an European clear distilled alcoholic drink that has been one of the most popular drinks across the world .

You'll find it to be the most popular spirit in drink making because of it's neutral taste and absence of flavour and colour.

Vodka often replaces Gin in many traditional cocktails

Vodka is known to be good for the heart, and if consumed in moderation, can prove to be good for cardiovascular health

Note that these days there are flavoured Vodka available in the market too, and some cocktails do make use of them.

Rum

Rum is a liqour that originated in the West indies and is made by fermenting then distilling sugarcane molasses or sugarcane juice. The distillate is usually a clear liquid and is then aged in oak barrels.

Most Rums are produced in the Caribbeans and American countries, but are now produced in other sugar producing countries like PHilippines and Taiwan.

The first recorded mention of Rum comes from Barbados, in about 1650. They were originally called "kill-devil" or "rumbullion" and later on, simply Rum.

Gin

Gin is a distilled alcoholic beverage that has it's origin in medicinal liquor made by monks and alchemists across Europe. The historical Gin producing regions are Southern France, Flanders and Netherlands. Gin was originally created to provide aqua vitae from grape and grain distillates.

During the Middle ages, the newly found substance Ethanol was considered by Alchemists to be the water of life, and an aqueous solution of ethanol was in use all over Europe and had different names and is literally the origin of many spirits like Whisky ( from the Gaelic uisce beatha for water of life ). Today Gin is produces from a wide range of ingredients, which gave rise to numerous distinct styles and brands. The predominant flavour of Gin is from the Juniper berries and then each different distillery flavours it further with an assortment of botanicas or herbs, spices, floral and fruit flavours, in different combinations. Gin is commonly drank mixed with Tonic water but it is also often used as a base spirit for many gin based flavoured liqueurs like Sloe Gin.

Kahlua Coffee Liqueur

Coffee liqueur is a liqueur produced by steeping roasted coffee, sugar and other ingredients in neutral spirit. The most famous coffee liqueur brands are Kahlua and Tia Maria, Kahlua has been made in Mexico since 1936.

However Kahlua has a thick buttery taste, that doesn't always appeal to the preferences of an alcoholic beverage lover. Which is why many people enjoy coffee liqueur made using their own home recipes.

Typical ingredients of coffee liqueur include liquor, espresso coffee, roasted coffee bean (and powder), sugar, and vanilla syrup.

The characteristic flavor of coffee along with over a couple of hundreds compounds contribute to the taste of coffee liqueur. Caffeine is a major ingredient of coffee, and also might be a taste factor that influences the complex flavour profile that appeal to coffee liqueur drinkers' palate. Reference - International Journal of Engineering & Advanced Technology (IJEAT)

NOTE: In the absence of a Coffee Liqueur like Kahlua or Tia Maria, to make cocktails with Coffee Liqueur, Coffee Liqueur Syrup can be used as a substitute with the proportionate alcohol substituted with a triple distilled neutral Vodka.

Lemon Juice

Lemon Juice being rich in Vitamin C is an excellent remedy for sore throat and aids in digestion and controls blood sugar, and also promoted weight loss. It is used for various culinary and non-culinary purposes all over the world. Lemon juice is known to reduce or even reverse the effects of excessive alcohol consumption and intoxication.
In drink mixing, fresh lemon juice brings a tangy zing to so many classic drinks and in fact, it's the most used ingredient in drink mixing other than the liquors of course.

Sugar

Brown Sugar is a sucrose sugar with a distinctive brown colour from the presence of molasses, it is a partially refined or unrefined sugar containing sugar crystals and residual molasses giving it a distinctive taste and flavour of crystallised molasses or toffee. The taste of dark brown sugar is described as a caramel taste with a deep molasses flavour.
Brown sugar is used in cocktails where a caramel candy or toffee flavour is expected.

Caster Sugar is finely ground granulated sugar. It is not as fine a powdered confectioners' sugar and has a little grit to it. It is somewhere between confectioners' sugar and granulated sugar, and melts in mouth with a mild spicy feel to the tongue

Vanilla Sugar is the regular granulated sugar infused with vanilla flavour, by using vanilla pods and seeds to flavour the sugar. A home made alternative is to use vanilla sticks or pods in a jar of sugar and leave it sealed for 4 weeks to allow the vanilla flavour to infuse. Or to use granulated sugar and vanilla extract and blend in a mixer, although this ends up in powdered sugar.

Ice

Ice is so obvious in most drinks, be it a straight drink or a mixed drink, that we often forget it's importance or even reason behind using a crystal clear good quality ice in a glass of whisky, or crushed ice in a tall glass to enjoy a cocktail.

Ice tempers a hard liquor, and as is in the case of whisky for example, if you prefer the flavours of whisky reach your nose without the hard note of spirit lingering around, or want to avoid the mild sting of a neat whisky, a cube of ice mellows the strength down a little and as it melts slowly, the aroma and flavour is released from the whisky slowly and makes whisky progressively weak, lingering and palatable.

Ice in Vodka helps release the little flavour a Vodka has, slowly, instead of letting the Vodka hit your nose all at once,

In mixed drinks, ice plays an important role in creating the perfect temperature a certain drink requires and bartenders use ice in several different ways, crushed ice for long drinks that will allow the cocktail to slowly water down like a Mint Julep, Moscow Mule, Rum Swizzle, Sherry Cobbler and other Tiki drinks, a large block or cubes of ice for drinks that are spirit heavy, such as the Old Fashioned, Negroni, and Manhattan