Buttermilk substitute › Budget Menu & Dirt Cheap Recipes › Equivalents & Substitutions › Buttermilk substitute This topic has 7 replies, 1 voice, and was last updated April 11, 2006 at 4:51 am by . Viewing 0 reply threads Author Posts April 11, 2006 at 4:51 am #243268 Shannon1 Thanks. I keep a thing of buttermilk powder in my kitchen. It doesn’t go bad and I would never use up a carton of buttermilk before it went bad. Author Posts Viewing 0 reply threads You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Register Log In › Budget Menu & Dirt Cheap Recipes › Equivalents & Substitutions › Buttermilk substitute