What would be the best water pill (or powdered form, preferably) to make me let go without thinking

I have found that castor oil is best for messing uncontrollably, but I have wondered, “What about wetting?” What water pill or equivalent would do so, and how much of it for it to work? I would prefer it in powdered form

For a non-prescription item--BOOZE and a liter of water or a few beers.

Booze, beer, water, especially the latter in generous amounts - I agree. However I am not aware of any magic fluid that will make you wet without control. Mostly it's learning by habit. I wear diapers every night now, and though I do wake up when bladder demands action, it's easy to let it go in a twilight state. I have listened to hypnosis tapes and repetition with a favourite does emphasize permission to wet. But they only do what you want them to do. There is no drug such as a diuretic that is likely to make you lose control. I searched a while ago to see if diuretics caused night wetting - it's a very low number and I'd question of it was that alone that did it. Rule of thumb - practice makes perfect.