You are bidding on two 18 oz portion of Vinegar Eels You culture vinegar eels by preparing a jug, plastic or glass, with a 50/50 mix of apple cider vinegar and de-chlorinated water. Fill the jug only to the widest part so that you have the maximum surface area for oxygen absorption. Then drop in three or four slices of peeled apple and add your starter culture. Keep the lid ajar or cover the opening with a piece of thin cloth held in place by a rubber band. If the neck is small you can use filter floss or a cotton wad as a stopper. The idea is to allow some oxygen to get into the culture.