First of all, if it is indoors below 23 degrees Celsius, bamboo leaf water can be stored for about 10 hour after boiling and cooling, and it can still be drunk.
Secondly, if bamboo leaf water is boiled with well water or spring water in rural areas far away from the city and then cooled, it can be kept below 23 degrees Celsius for about 18 hours and still be drinkable.
However, please note that if the bamboo leaf water is not boiled or left for more than 10 to 18 hours, it may go bad and no longer be suitable for drinking. In short, in order to ensure safety, it is recommended not to drink bamboo leaf water overnight.
The above information is for reference only. If necessary, it is recommended to consult a professional.