Black Bean, Avocado, & Corn Salsa

1 can black beans, rinced and drained
1 1/2 cup frozen corn, thawed
2-3 tomatoes
1/2 cup red onions, chopped
1/4 bunch of cilantro
1 package Good Seasons Zesty Italian Salad Dressing & Recipe Mix ( 2T of water, 1/4 cup vinegar, 1/3-1/2 cup oil)
2 avocados chopped
1/4 teaspoon garlic powder, or to taste
salt to taste