This makes many nondairy cooks dub soy milk the best milk substitute for cooking. But, just like when you're working with any new-to-you substitution, it can take a little bit of getting used to ...
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.