How to make buttermilk when you don't have any or don't use buttermilk daily.
USE 1 Tablespoon of lemon juice or vinegar plus sweet milk to make 1 cup (let stand for 5 minutes before using)
The pre-packaged cornbread mixes are very good and they are quick & easy to fix in a pinch. Just try different brands until you find one you like. Of course, nothing is as good as homemade cornbread.