If you are throwing a party and plan on featuring a specific cocktail or two, use the "How Many Shots in a Bottle" chart to figure out the amount of your base spirits and liqueurs you should have in stock. For a 4 hour event plan on 2-3 drinks of your feature cocktail per person. If you do need a large amount of a spirit try to find a larger magnum, Rehoboam, or Jeroboam bottle to break down the cost.