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The only exception to the situations I have outlined above is the one where a person might be well hydrated on minute but then find themselves dehydrated the next. On this occasion the bladder might be full of very dilute urine that would be useful if you could recycle it. And indeed you can - by drinking it!Granted, the taste won't be that appealing, but you would extract useful liquid from it. Once it becomes more concentrated next time around, however, this won't work.
Are you sure they don't just pee in their shell and their skin reabsorbs the water? :p