In a medium bowl, whisk together the Greek yogurt, lemon juice, garlic, salt, and pepper. Use a bowl big enough that you can really whisk the water into the yogurt well.
Slowly whisk in the water until the sauce is smooth and pourable.
Taste and adjust seasoning. Serve right away or store in the fridge, covered, for up to 3 days.
Video
Notes
Nutrition information is an estimate, calculated automatically. Values vary with brands, substitutions and portion sizes.