You can puncture the blister if you can get a bucket under it but if it is the wall that will be hard. I hope that it don't fall in before you can get it fixed and that you have good insurance. Please don't say anything about flooding. Most insurance does not cover flooding of any kind. Just tell them that you have a hole in your roof from the storm and water is coming in. Do not say the word flood in any form. I know what you mean about getting it fixed too. We don't know anyone that does drywall at the lake and the people there are definitely on lake time. I don't know if any of our drywall people will go up there. Bad as it will be on him my husband may have to get our son and some grandsons to help him do the work on our house there. I can't imagine not being able to do that and not knowing people. At least since it started after the storm that went through there insurance should cover it and probably a new roof or at least part of it.