What role do small containers of water play in heroin use?

Small containers of water play a critical role in the preparation of heroin for use. When users prepare heroin for injection, they typically dissolve the powdered form of the drug in water to create a solution that can be drawn into a syringe. This preparation process is essential for ensuring that the heroin can be effectively administered into the bloodstream. The use of small containers makes it convenient for users to mix the drug and water in the exact amounts needed for their dosage, highlighting the practical aspect of water in the preparation stage. Other options may describe different aspects of drug use or possession, but they do not directly pertain to the specific method of preparing heroin for consumption, which is why this answer is the most relevant.