Disclaimer: My girlfriend is willing and accepting of doing this. I'm not trying to secretly make her do this, she's well aware of what's happening.
The problem is more that her bladder is huge, and she's able to hold it for over 16+ hours. Sure she is able to purposefully pee, after holding it for a long time but I've been wanting to her to have a true accident, where she actually can't physically hold it anymore. Problem is we can go all day, and while she really has to go, by the time it's an absolutely an emergency, either she or I have had to be in bed for work for a while.
We've tried different things, like constantly drinking water or not going the night before. Having her down liquid puts her in a lot of pain, stomach and back wise. I have her stop when this happens, I have no desire for her to be in actual pain. When she drinks slowly though over the course of the day, she has no pain, just the uncomfortable feeling of having to pee. And she often loses sleep because she has to pee when she's in bed, so that is no good.
So I'm wondering, how can we have her hold her bladder starting when she wakes up (say around 9am) and have her actually have an accident within the next 12 hours?