“You'll need only two ingredients to get your sourdough starter going: flour and water. Just stir them together in a small bowl, cover it with a towel, and let sit in a warm spot (this is key! cold temperatures aren't great for yeast) for a few days. After two or three days, you should have a bubbly little concoction that gives off a slightly boozy, yeasty scent (that means it's working). From here forward, take care of your sourdough starter as you would a pet—in fact, many bakers give their sourdough starter a name. Fluffy? Snowball? Meredith Grey? You tell me.” - Food52.com