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@cbeleites, you may just want to skip that "plasma volume," because it is a bit confusing and unnecessary, but the total body water and the entire point of your post is just about right.
You mentioned the heat acclimatization, which increases sweating and therefore the water need - I'm not sure if I can read this from your answer, but you might want to emphasize it, because the OP is asking about how to decrease the water intake. Then, plasma volume increasing by 2-3 liters sounds highly unlikely to me, knowing that the average blood volume is about 5 liters. You might want to just skip that, because it may not be relevant for this question, anyway.
