I normally use mine to make certain breads like biscuits and cornbread. And sometimes by the time it runs out I've normally only got about 1/2 cup left in the jug. But then again I make biscuits pretty often in this household :)
Never thought about freezing buttermilk! Does it lose any of it's consistency when it's frozen?!
My late father's favorite was Southern milkshake. Cornbread crumbled in Buttermilk. It's not bad if you like buttermilk.
My parents use to ♥ Cornbread in Buttermilk... I've never been able to force myself to taste buttermilk by it's self, just smells weird to me. But I'll definitely do some cornbread & milk for a late night snack.