Final answer:
To prevent contamination, employees can safely drink from a closed container with a straw, which allows for hygienic drinking by minimizing contact with the container's surface.
Step-by-step explanation:
Employees can drink from a closed container with a straw if they handle the container carefully to prevent contamination. Using a drinking straw helps maintain hygiene as the straw acts as a conduit for the beverage without requiring the user to put their mouth on the container itself. This is crucial in avoiding the spread of germs, especially in a work environment where multiple individuals might share the same water source. It's important to remember that straws work based on the principle of creating a vacuum which decreases air pressure inside the straw, allowing atmospheric pressure to push the liquid through the straw and into your mouth.