It wouldn't be sensible to try and run a marathon with no fuel - your body simply isn't geared up for it.
Have you tried different brands of gels? I find Torq much more palatable than SiS, for example.
Jelly babies (or similar) will do a decent job, but you need quite a lot of them.
I did my last marathon with mainly Kendal Mint Cake. It's much more refreshing than gels, and gets plenty of sugar in you. There are some versions that also have electrolytes in them too (which can be important if you're a sweaty runner).
I have recently started using Velo Forte chews. They are very easy to eat on the go, and give you plenty of carbs - they're easier to eat than Jelly Babies. They're not cheap though, so I save them for longer runs.
I have a friend who uses dates as her 'on the run' fuel. Not something I've tried, or am keen to, but it works for her.
You've got plenty of time to experiment - start fueling on all your longer runs now, even if you're not officially training yet, and you'll find something that works for you!