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I don't know about 3 days; it would seem to me that one day is enough to ensure you are adequately hydrated (unless you are dehydrated to begin with).
Also, be aware that you can over-hydrate (both before and during the event). The symptoms of over-hydration are very similar to the symptoms of dehydration (dizzy, difficulty concentrating, etc.).
Drink enough the day before, and then drink a liter or so an hour before.
You can over-hydrate during the event, too, since you can drink fluids faster than your body can absorb them. In high temp/humidity environments, you can also lose fluids faster than your body can absorb replacement fluids, so don't wait until you are thirsty.
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Tom
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