No, drinking hot water does not make your voice deeper.
While some people believe that hot water can soothe a sore throat or temporarily improve vocal quality, it does not affect the fundamental pitch of your voice.
The pitch of your voice is determined by the length and tension of your vocal cords. Hot water does not affect the length or tension of your vocal cords.
If you are looking to deepen your voice, there are other techniques, such as vocal exercises and professional voice training, that can help.
