There seems to be an idea floating around the internet of a "water cure". The suggestion is that dehydration is the cause of many modern ills and that if we just stopped drinking coffee, soda and tea and stuck to good old plain purified water we'd be so much better off.
There may be some truth to it, but as a cure for Shy Bladder (as some have suggested) I think it's pretty unlikely (I'd like to hear from anyone that the "water cure" worked for - please post a comment)
Since Shy Bladder is a social phobia it seems unlikely that just drinking more water would be an effective cure. Would it cure, for instance, a fear of travelling in elevators (another social anxiety)? Very Doubtful.
What drinking lots of fresh water WILL do for you is give you plenty of chances to visit the bathroom and practice your graduated exposure therapy. That's a technique that will work to lessen the effects of and (if you're persistent enough) cure your Shy Bladder symptoms.
Having said that, there's nothing dangerous about the water cure and I'd be very happy to hear that it is an effective cure for Shy Bladder.