Question: How can I unstop a sink that isn't draining?
Option 0: First pour 1 cup baking soda directly into blocked drain (It's ok if there is some water backed up into it), then pour vinegar (about 2 cups) into the drain, it will react and unclog your sink.
Option 1: First pour 1  baking pan directly into blocked drain (It's ok if there is some water backed up into it), then pour vinegar (about 2 cups) into the drain, it will react and unclog your sink.
Answer: 0