Hi there!!
Your answer would be, The amount of urine produced will decrease in order to maintain the proper amount of water in the bloodstream.
Step-by-step explanation: If I can put this right haha but I would say that since you have little water to drink and your kidneys will probably not function as strong, you body doesn't want to realase too much when you go to the bathroom to keep a certain amount of water in your bloodstream to help you survive those really hot days and then the urine will probably decrease since that someone won't be really drinking anything.
Hope this helps!! :)
Happy Holidays
XX Ans XX