Final answer:
Lockstock is addressing the audience and advising against revealing too much about the water shortage at once.
Step-by-step explanation:
The subject of this question is English, specifically related to literature or drama.
In the given passage, Lockstock is addressing the audience and advising against revealing too much about the water shortage at once. This can be inferred from his statement, 'Not all at once. They'll hear more about the water shortage in the next scene.'