Final answer:
Substituting or watering down alcohol without informing the customer is false and illegal, and during Prohibition, such practices led to serious health risks.
Step-by-step explanation:
The statement that you can substitute one type of alcohol for another, or water them down, without telling the customer is false. This practice is considered fraudulent and unethical, and in many places, it is illegal. During Prohibition, the production, sale, and distribution of alcohol went underground. During that time, individuals and bootleggers were known to dilute alcohol with various substances, which sometimes resulted in dangerous or lethal consequences. Today, serving establishments must adhere to strict regulations regarding the serving and misrepresentation of alcohol to their customers.