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The metal drain stopper is unscrewed and then removed from a bathtub partly filled with water, allowing the water to flow into the pipes below. The bathtub itself is new from a recent renovation, but the plumbing is at least fifty years older. The tiled space allows the sound to resonate.
 

Empty Aquafina water bottle being filled to the top by a Diamond Springs water fountain. Recorded in a quiet, spacious room with an iPhone 6.

This is a sound recording of a Hamilton Beach Flexbrew coffee maker warming up and beginning to dispense a freshly brewed cup of coffee, as this coffee maker creates coffees one cup at a time. Recorded on an iPhone 6.

Sound recording of coffee being brewed in a Mr. Coffee Brand coffee maker. One can here the click of the start button and sounds of the coffee dripping into the glass pot, including other nuances like gurgling steam. Recorded using a Zoom H4n model.

A Keurig K45 Single Serve Brewer brewing 4 oz of coffee. The coffee is leaving the machine and entering a ceramic mug, which is located approximately 8 inches below the spout of the coffee maker. Recorded on a Zoom H4n.

Sound recording of an individual thirstily gulping water from a bottle in one breath. Recorded on an iPhone 5C.