Frozen buttermilk is good for 3 months. So long as the container is not completely full and the liquid has room to expand when frozen, you can freeze it in the container you purchased it in.

The answer is maybe, but only in a pinch. Buttermilk adds more than liquid to a recipe. It's brimming with active cultures, similar to the good-for-us probiotics found in natural yogurt and sour ...

if you don't have a ready supply of buttermilk, you can make a quick substitution for buttermilk by souring some fresh milk. Add 1 tbsp of lemon juice to every 100ml of milk called for in the recipe.