That evil villain, Bon Vivant, attacked the city's water supply with a deadly virus. The reservoir, up in the hills, is too wide and too deep for standard conditioning, and boiling the water won't kill the virus. But alcohol will.
I had finally found my calling.
I showed the police chief how my power worked, and changed a sealed bottle of water into wine. This would allow me to start the process of turning the reservoir into the world's largest pinot. With luck, I would be able to turn it back into water, after letting it sit for twenty minutes, to make sure the virus would be completely eradicated.
I am Sherry "The Vintner" Agrippa, and I made Bon Vivant less happy.