I had the same issue with not being able to pour the water into the basin and wanted to share how I fixed it. 1. Type into the console: player.sqs DLC1VQ07 All of the last 10 or so stages should all be 0, but one will be 1 (mine was 132, don't know if it always is) 2. Now, you have to load a previous save from before you filled the water completely. Load a save and use player.sqs DLC1VQ07 to check the stage 132 that was set to 1 should be 0 now. If not, you may have to go back to another save. 3. You don't really want to run all over this place again, so use movetoqt DLC1VQ07 to fill it up at each location. Save before you do it, fill it up, use player.sqs DLC1VQ07 to make sure that stage 132 is still 0, then move on to the next one. If it changes to 1, reload the save and try again. Mine worked the first time I retried it, but better to be safe. 4. You should be able to make it to pouring the water into the basin with that stage 132 set to 0 and it will trigger like it should and you will be able to enter the door. I don't know what triggers the stage 132 to set to 1, but this is the way I fixed mine.