As you probably know, dehydration is bad for gout sufferers and drinking water is good. The reason, apart from your kidneys getting more to work with so they can expel more uric acid, is that when the body gets dehydrated, the amount of fluid in your blood decreases - and your UA readings go up since the concentration in the blood increases when the amount of fluid decreases.
I was challenged on this in the "Gout" facebook group by Lorene Seman. I have not tested it
myself, reading scientific publications and trusting them is usually how I work. But fair enough. I feel healthy enough to take ip the challenge, so as soon as the current heatwave where I live is
ovet, I will take UA measurements as I dehydrate myself to check if the theory is correct (and a warning ahead of time - those readings will be applicable to me only, if you really wanted to do a trial you would need a much larger number of participants). So wait for a month or so, and then I will take up the challenge!