(We used a bottled, 100% natural spring water product.) Add enough of the bromthymol blue indicator solution to each bottle to obtain a green color (about 2–3 mL). BTB should be green in color. Add ...

Known for its naturally occurring carbonation and distinctive green bottle, Perrier offers ... or artificial flavors. Essentia Water is ionized to a pH of 9.5 or higher, making it a favorite ...