When tert-butyl alcohol is treated with H₂¹⁸O (water containing the heavy oxygen isotope ¹⁸O) in the presence of a small amount of acid, and the tert-butyl alcohol is re-isolated, it is found to contain ¹⁸O. Write a curvedarrow mechanism consisting of Brønsted acid–base reactions, Lewis acid–base associations, and Lewis acid–base dissociations that explains how the isotope is incorporated into the alcohol.