no buttermilk powder, how do I substitute?

Trying your lemon loaf in the segment on l6 lemon desserts. I know how to make buttermilk using lemon juice, vinegar etc, but I don;t have nor seen buttermilk powder. In the recipe for the lemon loaf there is 1 cup of water, do I use buttermilk instead? Thanks Debbie North Van BC Canada

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