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Kidney stones are a big problem in space because astronauts don't usually drink the 2 liters of water needed per day. This is a frame that would be specifically designed to fit on the arm of a spacesuit. On the inside of it (not included in the model) would be a watch type product that tells you how much water you drank that day. There would be 4 buttons on it. One to add 1 cup to the daily total, the other to add 5. On the other side, see yesterday's statistics, and start new day. If it is close to the end of the day and you need to drink more water, it will vibrate or make a sound notifying you to drink more water. By 2033, it could probably be made of a type of metal.
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