one serious complication of this is aspiration of fluid or food into the lungs which causes pneumonia. this would be more meaningful if he shared an example of the kind of tools he’s developed. then buckle down and learn a few of them everyday. this is a vacation the whole family will be wild about! this can also be done by putting a second layer of the same bottle over top, then wrapping everything in electrical tape (as in the very first photo). all papers are written from an authors personal point of view. 