Final answer:
In absence of a potable water source, an establishment must temporarily close to ensure safety and health standards are maintained. Using non-potable water or continuity without water is not safe or practical.
Step-by-step explanation:
If the water supply to an establishment is shut off and there is no alternate potable water source, the correct action for the establishment is temporary closure until the water supply is restored. Using non-potable water for operations such as food preparation, cleaning, and personal hygiene is not safe because it may contain harmful levels of chemical pollutants or microorganisms. While importing water from neighboring areas is a potential solution, it is not always feasible or sufficient for all operational needs. Therefore, the most responsible and health-conscious decision would be to temporarily close the establishment to ensure public health and safety.