What is the ruling on keeping a tightly sealed bottle of urine under the bed for days until it fills up, and does this prevent angels from entering the house? And must it be emptied daily?

It is permissible to use a vessel for urination. And for the sake of excellence, combining the narrations, it has been said that the prohibition of this is either understood to refer to a long stay with the urine, or that the prohibition is specific to the daytime and not the night. It is preferable to dispose of it during the day.