I am also doing a 1/2IM this summer - a move up from doing Sprints last year. Here is a link to the best advice I have heard about race nutrition/hydration. Although it is geared for a full IM, I think the same strategies work for the 1/2. I have been using these guidelines in my training thus far and it's working great.

http://www.coachgordo.com/...config.pl?read=30155

Good Luck this summer.

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put the mettle to the pedal