Salad Dressing Dry Mix: Mix salt, garlic powder, seasoning, mustard, paprika, pectin and sugar substitute in jar with tight-fitting lid.
Store in a cool, dry place.
Salad Dressing: Whisk dry mix, vinegar, water and oil in a bowl.
Refrigerate up to 3 days.
Vegetable Salad: Combine onion, celery, broccoli, tomato, squash, zucchini and cucumbers in large bowl.
Toss with 1/2 cup dressing.
Marinate in refrigerator for 30 minutes.
Spread lettuce over platter; spoon vegetables over lettuce.