Replicating Good Seasons brand Italian salad dressing dry mix
Classically a Italian blend would be:

teaspoon dried thyme 
teaspoon dried basil 
tablespoon dried parsley
tablespoon garlic salt 
tablespoon onion powder  
tablespoon white sugar 
tablespoons dried oregano 
teaspoon ground black pepper 
teaspoon celery salt
teaspoon salt


The just add water/oil/vinegar to make into dressing.