In the game, you will soon see four types of alcohol drinks, if you look closer at each, the logo on the surface indicate directions it represent:

From Left to Right, they are:
Grey(Down)
Green(Left)
Brown(Up)
Yellow(Right)
*You may also find direction indicators in the notebook at the counter bar, if you read carefully on each description of drinks, you will see the description contains keywords like"high roller" "deep down" "left" "right"etc.

As the notebook given there are four types of liquor in total, if you have knowledge about base wine/distilled beverages in real life, you will soon match them with their name based on the color.
From Left to Right, they are:
Grey---------Vodka
Green-------Absinthe
Brown-------Whisky
Yellow-------Tequila
*The notebook mentioned four types of alcohol, they are Vodka, Absinthe, Whisky and Tequila, apart from that, Rum, Brandy and Gin are also widely used in real life. They are all treated as liquor or spirits (because of high ABV%, "alcohol by volume").

• Vodka: neutral flavored clear spirit that is generally made from grains and potato. It is meant to be virtually tasteless, odorless and clear in color. Famous brand like Smirnoff is originated from US. Looks similar to the one in the game.
  

• Absinthe: an anise-flavored spirit derived from several plants, including the flowers and leaves of Artemisia absinthium, together with green anise, sweet fennel, and other medicinal and culinary herbs.Historically described as a highly alcoholic spirit, it is 45–74% ABV in US. Absinthe traditionally has a natural green color but may also be colorless.
  

• Whisky: Must be distilled from fermented grain juice and depending on where it‘s from, it must adhere to strict legal requirements. Bourbon, Scotch, Irish Whisky, blends, single malts, etc. all have certain requirements they need to adhere in order to earn their names.
  
  Bourbon Whiskey: barrel-aged American whiskey made primarily from corn(at least 51%, not over 80%), others include rye, barley and etc. Whiskey with added rye tends to have a more pronounced spiced flavor. Color: Amber, orange, red or brown. The barrel aging process gives bourbon its brownish color and taste.
  

• Tequila: made by distilling fermented blue agave, originated from a town named Tequila from Mexico. Color: Blanco("white") or plata(“sliver") or Oro("golden") or others.
  

Basically after adding all the spirits you need in the shaker, Click the Shaker once and it will follow your mouse, just move Up and Down(be careful not to spill out). Repeat that relentlessly in several seconds and you will see the colors blend together, which means it is done, then just pour the shaker into the glass like you pour other drinks.

Wikipedia, Content Creator"aaronlearning"
Pictures are from public sources on google images

The article is to give a basic introduction and background knowledge, while there could be slight inaccuracies or deviations from the facts.

Blend Red Secret and Blue Whisper together in the Shaker, it will become something called Pink Spirits. The pink spirits could invert any alcohol drinks directions. All you need is adding the spirit you want into the pink spirits to change the direction. For example, if i add vodka(down) into pink spirits, then the mix will be able to turn the thing up.