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