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jamesf said..
For racing we need to wear a life jacket, so a lot of us use the NPX vest which has a clip on hydration pack (Hydropouch). I stopped getting cramps while sailing as soon as I started using this. On really hot days I fill it with Staminade (which has added potassium), but I like Jimbob's idea of filling it with two longnecks.
http://www.npsurf.com/products/protective/impact-flotation-vests.html
I use this one too. It really makes a difference to energy during a session and post sailing recovery. I had to shorten up the straps so it didn't move during sailing but now I don't even know it is there. I used to fill mine with gatorade until I discovered I am allergic to it. Now I use lemon cordial. It holds 1.5L, but I don't drink the full amount even when I sail all afternoon.