Question

This water was then carried home for invalids. (Voice change)

Answer 1

Given sentence:
The water was then carried home for invalids.

Sentence after changing voice:
Then, they carried water him for invalids.
(Hidden subject here is "They")

Additional information:
Active voice - A type of sentence where in the subject of the sentence precede the object of the sentence.

Passive voice - A type of sentence wherein the object of the sentence precede the subject of the sentence.

Answer 2

For invalids this water was then carried to home.

Hope it helps