3 liters apple cider (see recipe)
1 packet dry yeast
1 cup sugar
3 liter glass jar
1 plastic lid
3 1 liter plastic bottles
Pour warm cider into the jar. Add the yeast. Cover with plastic lid, making sure to poke a small pen-sized hole in the lid beforehand. Stick a straw in the hole; so that air can escape but nothing can get in (bend the straw slightly). Let sit for 2 weeks at room temperature, or until bubbling stops.
Transfer to clean plastic bottles. Add 1/3 cup sugar to each bottle, using a funnel. Tightly screw on caps. Let sit for at least one more week at room temperature. Refrigerate before drinking. Open over the sink, because the cider can be very carbonated. Yields 3 liters.