Combine all of the ingredients in a bowl or mason jar and whisk well to combine. Add extra water one tablespoon at a time, until the dressing is as thin as you'd like it to be, and adjust any seasonings to your taste.
This dressing will thicken up when stored in the fridge. It's great as a dip, but if you want to thin it for a salad dressing, just add another tablespoon of water and stir until pourable again. This should last up to a week in the fridge.