Replicating Good Seasons brand Italian salad dressing dry mix I use the dry mix in a ranch chicken recipe. I would like to make my own version from scratch. How would I go about trying to duplicate there recipe so to speak? I've looked at the list of ingredients on the package but I don't know what actually makes the flavor, and what is preservatives.

Ingredients: sugar, salt, sodium, citrate, garlic, onions, spice, red bell peppers, carrots, xanthan gum, maltodextrin, parsley, guar gum, natural flavor, soy sauce (wheat, soybeans, salt), citric acid,
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.