COMBINE pesto, vinegar and water in small bowl; whisk to combine.
PREPARE pasta according to package directions; rinse in cold water and place in large bowl. Drizzle with half of pesto vinaigrette. Cover pasta and remaining vinaigrette with plastic wrap; refrigerate for 30 minutes or until cold.
TO ASSEMBLE, alternately thread ingredients on each skewer in the following order: tomato, tortellini, basil, cheese, tomato, tortellini, basil, cheese and tomato. Drizzle with remaining vinaigrette before serving.
Cook's Tip: These skewers make great appetizers for entertaining or serve 3 skewers together as a main dish.