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@Greenbank
What distance/duration?
I do all my swimming on an empty stomach, even when I was doing a 1h20/4k swim several times a week. But then I've had years of on and off distance related stuff (Audax, marathons, etc) and so my metabolism is quite good at stretching out my glycogen stores by burning mostly fat.
If I eat before exercising it needs to be at least an hour before (and usually something like weetabix), but that is a real pain for early morning exercise as I'm up early enough as it is and want to limit the time between getting up and starting exercise.
(Back up to 1k today and dreading the idea of distance swimming less, but still slow.)