Final answer:
Tap water, water jugs, and water bottles contain various chemicals, including disinfectants used in tap water treatment and impurities from the environment. Water bottles may also contain minerals found in hard water. It's important to note that all water contains dissolved substances.
Step-by-step explanation:
Tap water, water jugs, and water bottles all contain various chemicals. When tap water is treated to make it safe for human consumption, chemicals such as chloramines or chlorine compounds may be used for disinfection. Groundwater contamination can also lead to tainted tap water, which may contain impurities from the environment. Water bottles may contain chemicals listed on their labels, such as magnesium and calcium in the case of hard water. It's important to note that water itself is a good solvent for many compounds, so almost no pure water exists in nature.