Mix whole milk with lemon juice and let sit for 10-15 min until slightly curdled.
Mix whole milk with white vinegar and let stand for 10-15 min; curdles and thickens.
Shake/stir whole milk with cream of tartar until dissolved.
Thin sour cream with liquid and stir to combine.
Blend yogurt with milk or water to buttermilk consistency.
Mix Greek yogurt with milk in a 1:2 ratio until smooth, dilute as needed.
Mix almond milk with apple cider vinegar and let sit for 10 min.
Follow package directions for powdered buttermilk, mixing into dry and adding water to wet ingredients.
