Use the limeade can to measure the ingredients, and adjust with extra water if the mixture seems too sweet. Straining the pulp is always a good idea, unless, of course, you like pulp!
1 (12 fluid ounce) can frozen limeade concentrate
12 fluid ounces tequila
12 fluid ounces water
12 fluid ounces beer
1 lime, cut into wedges
Pour limeade, tequila, water, and beer into a large pitcher. Stir until well-blended, and limeade has melted. Add plenty of ice, and garnish with lime wedges. Adjust with additional water, if needed.