In a 1-cup measuring cup, add 1 Tablespoon of fresh lemon juice. Top the lemon juice with skim, low fat or whole milk. Stir and let sit for two minutes. After two minutes, your milk is both acidic and curdled. If you need 2 cups of buttermilk, add 1 tablespoon plus 1 teaspoon of lemon juice or vinegar to the milk.
Larger broken bones, for example the bones in the thigh, or both bones of leg would take a great deal longer to heal, usually six weeks to three months in the average healthy adult. Begin physical therapy as soon as is practical. That will help.
Keep it buddy taped, put ice on it every now and then for swelling. The break itself should heal within 2 weeks but the swelling and ligament damage will take a little longer. If if hurts to walk, walk more on your heel and inner foot. I've broken at least 5 toes and my pinky toes repeatedly. Not much you can do about it but take pain meds and let it heal.