What is the collective noun for canteen?

There isn't a commonly used collective noun specifically for canteens.

However, you could use some of these options depending on the context:

* Set: A set of canteens

* Collection: A collection of canteens

* Array: An array of canteens

* Assortment: An assortment of canteens

You could also use a collective noun that describes the contents of the canteens:

* A spread of food: "The canteen offered a spread of food for lunch."

* A variety of drinks: "There was a variety of drinks available at the canteen."

Ultimately, the best choice depends on the specific situation and what you want to emphasize.