You probably don't need to drink during 90-ish minute race, but it might help. But definitely don't carry any with you.
Instead, grab a cup, walk 3 strides while you swallow the water, start running again. You will loose less time with this method than you will by carrying a water belt. If you're not good at it, then practice it a few times before the race.
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Bullet the Blue Sky
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RE: Do I need water in a half (1:32 goal, 40 degrees race day)?
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