GFCF "Buttermilk" Ranch Salad Dressing

I love Ranch Dressing. Sadly, most of it is taboo...unless I make it at home! I used to make this with a combination of mayo and sour cream, but I tried it with just mayo and it really was pretty good. It fixes that ranch dressing craving, at least!2 tbsp. Ranch Dressing Base (such as Penzey's Buttermilk Ranch)3 tbsp. water1 tbsp. vinegar, lemon juice, or water1/4 cup mayo (Whole Foods 365