Non-dairy Buttermilk Substitute in Baking

I know I can add a bit of vinegar to regular milk and turn it into a buttermilk substitute, but can I do that with soy milk? I really want to make a batch of muffins, but the recipe calls for buttermilk. My lactose intolerance has been getting worse lately, and I've cut almost all dairy from my diet, so just using buttermilk or any other dairy-based product is out of the question.

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