How long can keep water in water bottle

Preferably not more than three days
Many factors affect how many days the water in the cup will last, such as the temperature of the water, the material and tightness of the cup, and whether there is external contamination. Specific influencing factors and corresponding suggestions are as follows:

The temperature of the water in the cup: The water in the stainless steel thermos cup can remain unspoiled for a relatively long time because it is in a sealed state. Generally speaking, the boiling water is poured into the stainless steel insulated cup, if the cup is well sealed, there is no problem for three days.

The material and tightness of the cup: the lid needs to be screwed on and covered tightly, so that contaminants such as dust are not easy to enter, and the water can be placed for a longer time. But even then, it is not recommended to leave it for more than three days.

External contamination: If the cup is placed open, or the lid is not closed tightly, the water may be contaminated by dust, bacteria and other external contamination. In this case, the shelf life of the water will be greatly shortened, and it is usually not recommended to leave it for more than one day1.

Therefore, there is no fixed answer to whether the water in the cup can be placed for a few days, and it needs to be comprehensively judged according to the specific situation. In order to ensure the safety of drinking water, it is recommended to shorten the storage time of water as much as possible, and pay attention to keep the container clean and sealed.