I had a bladder diverticulum some years ago and my bladder doesn’t tell me I have to go until it has 400 to 500 ml in it! Then I can go but only empty’s about 100 to 200 MLS. , because the muscles in the bladder aren’t strong. I use a pocket catheter which is easy to carry and it is also self lubricated. At night I instill acetic acid solution or a probiotic to keep me from getting UTI’s.