Ingredients:
Williams and Sonoma bottled margarita mix
1 cup fresh lime juice per bottle
tequila

Method - The Procedure
Williams and Sonoma makes a bottled margarita mix that is very good if you add 1/2 to 1 cup of fresh lime juice per bottle (otherwise it is too sweet). It makes life much easier for a large party, though for just a round or two it still best to make your own. Combine lime juice with Margarita mix and add tequila to taste.

This recipe from CDKitchen for Like Homeade Margarita serves/makes 1