misting up windows

[irishastraowner]

I have had extreme misting in the inside of the car for a long period. I found the spare wheel well to be full of water. I drilled a hole in the 2 grommets in the wheel well so as to let the water escape. Today I have discovered the floor of the drivers seat and the floor of the seat behind the driver to be absolutely saturated. There is a small little access point in the floor of the drivers seat where i opened and found a significant amount of water there. No similar access point in the floor of the seat behind the driver but the floor is also soaked.

My question: (1)Where do I start to trace the leak? (2) Is the water in the boot and the water in the 2 areas mentioned above the same source would anyone think?