A rain stick can give that effect. It's a percussion instrument.
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a musical instrument used in Panay consisting of a tube with a pipe. It is played by placing water in the tube and blowing the pipe. The presence of water produces a whistling sound.
Other instruments make the initial sound from vibrations in solid matter (e.g. strings or percussion), or vibrations in gaseous matter (e.g. wind instruments). With hydraulophones, the sound originates from vibrations in liquid matter, such as water. Thus hydraulophones are neither chordophones (string instruments), membranophones, idiophones, nor aerophones. Hydraulophones are an entire new class of instrument, for which hundreds of different kinds exist, e.g. some are reedless (e.g. waterflutes), some have underwater reeds, some have underwater tonewheels (or valves, etc.), and the like.
sahunay-a bamboo flute in sulu with 6 holes pasiyak-a musical instrument in panay.it is played by placing water on it and blowig it
My idea is that the water vibrates and sends sound waves through out the water and up the bottle creating the echo. I think that the more water the more high pitched the sound because since in water there are less particles to interfere with sound waves and water muffles sound. So in the bottles with less water the sound is deeper and lower pitched because the sound waves are mostly reverberating against the bottle.
Hydrophone