Remember that the type of response is not specified in the mand. You can say “water,” write “water,” use sign language – any kind of response, as long as the controlling variable is an establishing operation.
A form of verbal behavior with the following features:
The response is verbal
The form of the response is controlled by an establishing operation
The musculature with which the response is executed (vocal, written, gestural, etc.)
The type of reinforcement made currently effective by the establishing operation (may be conditioned or unconditioned, etc.)
Whether or not the current response is followed by reinforcement