There is no "on/off"
According to the emergency doctor, there is only drowning when your lungs become dehydrated and you swallow lots of water. There is no "on/off" situation. It is rare that someone drinks the cup and then dies three day later. The legend of dry drowning is only meant to alarm parents. ".
Are there signs of concern?
If signs do appear, they will usually be apparent within hours of drinking water. If a child is found drinking from the cup frequently, they should be monitored. Lung infection can develop slowly if a child has a persistent cough, fever, or difficulty breathing. However, this will not happen overnight. There is no reason to be alarmed if the child does not cough after 15 minutes.
Public Health France emphasizes the importance of this point, stating that the concept of "dry drowning" has no scientific basis, and that there is no evidence for drowning that does not involve water in the lungs.
Benefits of disconnect vacations
Source: Destination health