Mix one to two tablespoons of vinegar in eight ounces of water. (selfcarer.com)
Simply add one tablespoon of vinegar per cup of milk and let sit a room temperature for at least 15 minutes, until the liquid has thickened a bit. (onegreenplanet.org)
1 tablespoon of vinegar into a 1 cup measuring cup and top to 1 cup with milk. (spendwithpennies.com)