<human>: Objective: How can I amplify my phones speakers without electrical magnification?

Which of the following solutions is more sound in terms of naive physics reasoning?

OPTIONS:
- Put your phone into a drinking glass or a bowl, face the phone toward yourself  to boost the volume of its speakers.
- Put your phone into a drinking glass or a bowl full of water, face the phone toward yourself  to boost the volume of its speakers.
<bot>: Put your phone into a drinking glass or a bowl, face the phone toward yourself  to boost the volume of its speakers.