Makes about 10 cocktails in a 2 quart pitcher 

Pour mezcal, Lillet blanc, simple syrup, bitters, and water into a 2-quart pitcher and stir to mix. Seal well, covering with plastic wrap if needed, and refrigerate for at least 2 hours (or overnight).

Before serving, prepare fresh celery and lemon juices and stir into the pitcher mixture.

To serve, place a large ice cube in each rocks glass, then pour in cocktail and garnish with a small pinch of salt and a lemon wheel.