What is produced when acetic acid and water are combined through a two-step fermentation process?

Acetic acid and water are combined to create vinegar through a two-step fermentation process. 

Vinegar is produced by a two-step fermentation process. The first step involves the conversion of sugar or other carbohydrates into alcohol through the action of yeast. The second step involves the conversion of the alcohol into acetic acid by bacteria known as Acetobacter. This process takes place in the presence of oxygen and results in the production of acetic acid and water. Acetic acid is what gives vinegar its distinct sour taste and also makes it a useful preservative due to its antimicrobial properties.