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I don't think I want to swim 10k in a pool but something like the Dart10k is very tempting. Like cycling and running for me swimming is exponentially better outside with changing scenary, actually going somewhere etc.
This year I swam the Bantham Swoosh which was fantastic. It's about 6km as the crow flies but based on my stroke count and comparing to swims without tide assist was more like 3.6km so I haven't really swum further than you. I had a bit of wetsuit rubbing under one arm which was unexpected and hurt for a week after but I assume the pool is skins so that isn't a problem for you.
I think I'd be cautious with energy drinks unless you are used to them in training? I find things sloshing around in my tummy can make me feel worse. Do you really need it for a couple of hours anyway? Just get really hungry and then eat a massive meal afterwards works for me :)
jellybaby-
Thanks for the advice. Yes it's in a pool so no wetsuit. I was also under the impression that water temp makes a big difference. For example I was regularly swimming 3 km odd at Gospel oak lido in the summer before work and what stopped me hitting 5k was fatigue. My arms were just exhausted and I felt I couldn't really continue. That's why I thought a sip of energy drink every km might help. Also the lido at the time was 24 which seemed perfect. I expect the pool to be closer to 30. How does that effect things?
mikec
Sound advise thanks guys. 10k seems seriously far not sure I'd be able to swim that far!