Um no there isn't. A mental institution is a hospital for people with some kind of negative or odd mental state. No one in this movie was in a mental institution.
In the book’s sequel, a large part of the plot has to do with eating disorders (specifically bulimia) but none in this movie. So if you’re triggered by that then try not to get too obsessed with the franchise
There's a scene where in one of Bailey's lives he saves a girl from drowning. It shows shots of them being underwater and him carrying her to the ground. However, none of the characters drowns.