Combine all ingredients in a glass jar (or bowl) and mix well. Store in a sealed container. Use 1 tablespoon at a time when serving.
To turn ranch seasoning into dressing:
Combine 1 tablespoon of ranch seasoning with any of the following variations:
1/3 cup yogurt (greek or regular) and 1/4 cup milk
1/2 cup mayonnaise, 1/4 cup sour cream and 1-2 tablespoons of milk or buttermilk
1/4 cup mayonnaise, 1/4 cup sour cream, 1 teaspoon olive oil, 1 teaspoon lemon juice, 1-2 tablespoons buttermilk
Notes
You can use ranch seasoning in place of store-bought packets in any recipe as well.