This is a hint for the game White House Escape. Please be warned, the following hint gives information that could be considered a spoiler. For this reason, we would like to caution you about reading the hint unless you are certain that you want to proceed with knowing the information contained herein.
The water alarm, as its name would indicate, sounds an alarm when the unit detects water (i.e. it gets wet). A handy source of water would probably be the water fountain. Use the water alarm with the fountain, and the alarm will start sounding off. However, the alarm duration is timed, and it will only sound for a limited number of turns.