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I've done a bunch of long swims. For things longer than 4 miles, generally had kayak escort, so had fuel on board and took something (liquid) q30 minutes. Shorter, usually tucked a gel into my swimsuit in case I was about to die. Practice treading water in the deep end of a pool and drinking before hand if you're going to do so, because if you're like me, you'll nearly aspirate a few times. I'm guessing that if it's normal open water rules they won't let you get out of the water to grab anything.
Do it. You'll be fine. I've found that jumping into up to 25k is no problem off of regular old training (which for me is 2 trail shuffles a week, plus a bunch of bike miles). Did one 50k on gravel roads, that was much more painful and I'd recommend actually training for that. Plus there's usually whiskey at the trail run aid stations, which helps immensely. The variation in stress on your body from dodging rocks/roots/etc will tear you up much less than pounding a pavement marathon even though it takes longer.