What do I need at the liquer store for a Margarita?

I want to make it with a 750mL bottle of Jose Cuervo this weekend, some good, but cheap tequila, and what other drinks do I need from the ABC store to make a decent one. I got margarita cocktail bottle before, but that was cheap and nasty. I usually drink beer, but have been craving for Margaritas. Do they sell lime juice at ABC store, I don't really know what brands of lime juice or other liquers and sour mixes to add. I don't want a straight Tequila margarita, something smooth and flavorful, and I want to spend around 20 bucks total for everything. I've seen Jose Cuervo for about 15 bucks, but I know I'm gonna have to spend money on other mixes.