Question

Many of them offered bowls of water to my father. - Change the voice

Answer 1

Bowls of water were offered to my father by many of them.

You need to understand that active voice is the one that was the subject is performing an action.

You need to bring that subject as an agent described with the help of ‘by’ then next thing is that object will come at the beginning of a sentence and then change the form part-present-future.

Answer 2

Answer:

Bowls of water were offered to my father by many of them