In a bowl or glass container, whisk together the powdered milk, warm water and lemon juice.

Mix until smooth and then let the container sit on the counter for 30-45 minutes or until the lemon juice starts to slightly curd the milk.

Keep the buttermilk in the fridge until cold. Use in homemade dressings, to batter chicken, in pancakes, etc.

Buttermilk will keep in the fridge for 2-3 weeks.