Better yet, these bottles can be reused over and over again as long as you make it a point to re-sterilize each bottle after every use. All you need are a good bottlebrush and a sterilizing agent (don't forget to check the expiration date though). If a sterilizing agent is nowhere to be found, plain household bleach should be sufficient enough to do the job. This is an important storage implement and this should not be left out in your shopping list. This is placed at the opening of the carboy, and your air lock will be placed on the stopper. Now the stoppers may come in different sizes as well, and choose depending on the size of the carboy. The airlock. Beer had been a good substitute for water. With the advent of industries during the 17th century, brewing beers had been brought to commercial sphere which resulted to mass production of beers. Science, especially chemistry, had a big impact for such activity. Having learned that brewing is a chemical reaction activity (fermentation) series of experimentation had been made that resulted to varieties of beers. If you have already perfected the art of home brewing and you have done your part in impressing friends over a few rounds of beer, then that is the time to expand and find a market. If you brew some of the best beers in town, then chances are a commercial bottling company will take notice and call you for a meeting. Take note, home brew beers are not taxed as long as they are not for commercial distribution. Second, home brewing is one way of gaining self knowledge about this particular endeavor. It may even become your hobby that eventually hone and develop your skills that will certainly be a potential asset to gauge oneself from others. Years ago, the materials involved in home brewing are a can of Blue Ribbon malt extract, a 10 gallon ceramic crock, and a pile of Fleischmann's bread yeast. Now, home brewers can purchase Coopers Beers kits, which are relatively cheaper and more unwieldy than earlier beer home brewing kits. Due to these significant changes, home brewers are now producing beers with better quality.