2 cups (8 ounces) Cheddar cheese, shredded
2 cups (8 ounces) Colby cheese, shredded
2 cups milk
12 ounces beer
1 teaspoon Worcestershire sauce
1 garlic clove, minced
6 tablespoons flour
½ cup water
3 tablespoons fresh chopped chives
4 slices bacon
8 pretzel buns for serving, optional