In general, a 750-milliliter bottle, known as a fifth, will yield about 16 drinks when you use a 1 1/2 ounce pour of the spirit. If you're using a mixer such as a pre-made Bloody Mary or Margarita mix, calculate about a quart of mixer for every three guests. You'll also want to stock up on cocktail, highball, or margarita glasses, drink stirrers, ice, garnishes, and napkins. When you're holding a gathering, you can also order most party supplies through Instacart and have them delivered the same day. If you need to shop at another store for your party supplies, you can order from multiple stores and have Instacart shoppers deliver them to you, so you don't have to leave the house. Whether you need spirits for your next gathering, to make your favorite cocktail, or to sip over ice while relaxing in front of a crackling fireplace, enjoy the convenience of ordering your spirits through Instacart.