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@HatBeard
for 5k I'd just run on an empty stomach but carry a little bit of water with you (250ml) and drink a little bit every now and then to stop yourself getting dehydrated (i had to do this when I started now I don't even need water for up to 10k distance really). at most have something small like half a banana no less than 30 minutes before you start. you don't really need any more energy than what your body will already have stored up in reserve.
the more you run the more you'll get used to it and this stuff will become a lot less important too. until you need to start considering fueling for long distances.