about 5 years ago a nurse suggested that I use plastic wrap placed across the toilet bowel with a pouch formed in the middle to collect the sample. If you use the good stuff that clings to everything you won’t need tape to hold it. She said after collecting the sample just flush the plastic wrap down the toilet. She assured me that it would not clog the toilet. I Have been doing it this way a couple of times a year ever since without a problem. Unless the container has its own scoop I use a clean popsicle stick to collect the sample. Afterwards I clean the stick by holding it in the running water in the toilet after I flush it, and then throw it into the regular trash.