I should note that I only actually made this mix into salad dressing once because I was out of other dressings. It was good- better than store bought dressing- but not as good as the homemade fresh kind. The rest of the mix has gone into recipes that call for the dry kind. Because I only made it into salad dressing once and it was spur of the moment, I didn't measure anything. If you want to turn this into liquid salad dressing, I suggest stirring together milk and mayo until it has the right consistency, then stirring in the dressing mix until it tastes right. Soon I will update this with more specific measurements.
Homemade Ranch Dressing Mix
1 C buttermilk powder2 Tbsp dried parsley