Question

Bring a glass of water ​

Answer 1

Passive Voice : Let a glass of water be brought. Cambridge English Dictionary defines 'passive voice' as 'the relationship between a subject and a verb in which the subject receives the action of the verb, or the verb forms which show this relationship. '

Answer 2

=》You are asked to bring a glass of water.

Or

=》 Let a glass of water be brought.

Both are correct✌