Buttermilk is very easy to make from scratch and only takes a few minutes.
Mix the lemon juice and milk together and let sit for 5 minutes.
After the 5 minutes you can use this as traditional buttermilk in whatever calls for it. Whether it be pancakes, fried chicken, biscuits, etc.
Found How to make Buttermilk by VermontBlogger on https://vermontblogger.com/recipes/how-to-make-buttermilk/