What's the plural form of Vichy water? Here's the word you're looking for.
Answer
The noun Vichy water can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be Vichy water.
However, in more specific contexts, the plural form can also be Vichy waters e.g. in reference to various types of Vichy waters
or a collection of Vichy waters.