This sounds like the seal has become compressed over time, and you require a new door seal.
However before looking to order a replacement seal from here, which costs around £40. I would look to check if the hinges on the top and bottom of the door have come lose, and if there is anything causing the door to have become buckled or in some way resisting against the door closing.
The water is caused by condensation where the door seal is not making a good contact, and the cold air is escaping.
Good afternoon, I saw the additional question raised this has been marked as a duplicate, please only respond in this forum, so to prevent being double charged (for a second question).
With regard to the question about a video on how to change the seal, the process is the same on all makes and models, when you order the seal it comes with instructions but to be honest the video here is far more useful.
Appreciate if you can rate the service received.