If you are able to provide your own liquor for your reception, here are a few guidelines on what to buy based on the standard of 100 guests. Each “fifth” of liquor will serve approximately 17 drinks. For a buffet wedding, estimate that each guest will have five drinks. Remember, these are guidelines and your individual situation may vary. Be sure to discuss this with your hall, caterer or liquor store. They may have their own “suggested amounts” based on their experience at their facility.