prompter: Why does water taste weird when it sits in the bottle for a long time? I don't understand how it's fine while sealed but then "goes bad" a few days after opening.

assistant: Water tasting “weird” when left unsealed can be due to several factors:

* If the water has been exposed to air for a while, the concentrations of gases dissolved in the water can change, giving the water a different flavour.  These gases likely include oxygen, carbon dioxide, aldehydes, acetone and others.  When the carbon dioxide concentration, for example, is increased, then so is the acidity, which will change the flavour.
* Over time minerals may precipitate out of solution and create further changes in the flavour of the water. 
* There may be microbial growth. When stored properly with a lid or cork, most bacteria are unable to grow, but when exposed to air this is no longer the case and bacterial growth can occur.
* The temperature of the water can affect its flavour as well.  If the temperature after sitting for a while is different than the temperature after having opened the bottle, this can affect the taste.

prompter: Do you think I should drink that contaminated water?

assistant: Absolutely not. Consuming contaminated water can have serious health consequences, including the risk of contracting waterborne diseases and infections. It is important to avoid drinking contaminated water and to only consume safe and clean drinking water. If you are unsure about the safety of your water source, it is recommended to use a water filtration system or to obtain water from a trusted and reliable source.

assistant: Wait, who said it is contaminated?  If it is, you should not drink it.
If it isn't, then you should be fine.

prompter: How can I tell if it is contaminated?

assistant: That has to do with oxidation, bacterial growth as well as the materials the container is made from.

assistant: Let's assume that the premise is true, i.e., that the water in your bottle under consideration stays fine while the bottle is sealed but goes bad within a few days after opening the bottle. Then, the logical conclusion is that something changed by breaking the seal. This could be related to reduced pressure or the air outside interacting with the content of the bottle (or both).

If the water in the bottle is carbonated, then, due to reducing the pressure in the bottle, the CO2 that was previously dissolved in the water returns to a gaseous state and leaves the bottle. This has major implications on the taste, and since people usually buy carbonated water for its taste, they may consider the taste without the CO2 bad.

Another possibility is that O2 enters the bottle which then enables bacteria to digest substrates contained in the water. The substances resulting from this process may make the water taste stale.

prompter: Or, perhaps I am imagining things.

assistant: when water is exposed to air, it can develop a stale taste caused by carbon dioxide in the air mixing with the water. This process lowers the PH level of the water and makes it more acidic. 
This applies to both taped water as well as bottled water. 
Despite the taste, the water is safet to drink for a long time.

prompter: How long is a "long time"? And does carbon dioxide continue to dissolve into the water or does it reache a limit at a certain amount?

assistant: The length of time it takes for water to develop a stale taste can vary depending on a number of factors, such as the temperature, the level of carbon dioxide in the air, and the type of container used to store the water. In general, water that has been exposed to air for several days or longer may start to taste stale or flat.

Regarding the amount of carbon dioxide that can dissolve in water, there is a limit to how much can dissolve in a given volume of water at a given temperature and pressure. Once the water has reached its maximum capacity for dissolved carbon dioxide, any additional carbon dioxide in the air will not dissolve and will instead remain in the air space above the water. This is why the taste of water can change over time, even if the bottle or container remains sealed, as the carbon dioxide in the air space above the water can still interact with the water and affect its taste.