I have made half of the recipe below and it will probably last me for the remainder of this year (or more). Also I only made 1/4 of the salad dressing which will last about two weeks in the fridge. So the first recipe is the mix and then below it will be the steps to making the salad dressing.

Ranch Dressing Mix:
1/4 cup Black Pepper
1 1/2 cups Parsley Flakes 
1/2 cup Garlic Salt 
2 TBS Kosher Salt 
1/4 cup Granulated Garlic 
3/4 cup Granulated Onion 
2 TBS Dill Weed 
Combine all ingredients, store in an airtight container. Makes about 3 ½ cups of dry mix. 

--------------  PENDING: Conversion to whole-food, plant-based recipe --------------

To make the traditional salad dressing, whisk together:
2 TBS of mix
2 cups mayonnaise 
2 cups buttermilk
1 1/2 cups sour cream 
1 tsp Lemon Juice 
Refrigerate for 2 hours. 
Makes 1 3/4 Quarts

Here is the quantity of mix I used to make a smaller amount - just enough for two weeks in our fridge.
1/2 TBS of mix
1/2 cup mayonnaise
1/2 cup buttermilk (or milk)
1/2 cup sour cream
1/4 tsp lemon juice

Best of all, the kids like it. No MSG. No preservatives. Fresh, natural and REAL.