1800 Ready to Drink Margarita 1.5L- The tequileros at 1800 Tequila have added their super-premium silver tequila to a bottle of margarita mix for the only ready-to-serve margarita made with 100% blue agave tequila on the market. This is the perfect bottled cocktail for a picnic, potluck, a last-minute get together or when you just don't feel like standing behind the bar all night.