This maybe readily sterilized and examined to check progress. An airlock is used to keep out unwanted air. These are usually made of plastic and consist of an inverted cup over a stem. The combination holds enough water so that carbon dioxide may escape by bubbling through the water. When the yeast is deprived of oxygen, it changes its method of growth, producing much more alcohol.
New wine bubbling merrily in the jug is a beautiful sight.
Fermentation will slow as the sugar is consumed and in two or three weeks will be essentially complete. It is not time to rack or bottle the wine. The process of bottling wine can be given the dignity it deserves by the use of special wine bottles, corks and even foil and labels. However, you can just as well use soft drink bottles which have a screw top. Be sure the bottles are clean and free from odor or contaminants.