Tony,
I say keep it simple. Eat foods that agree with you. Carbs are your fuel, so things like porrige, pasta etc are excellent fuel sources. Post training run, nothing more than a glass of milk is needed.
Half marathon training will not deplete your bodies fuel stores. There is no real need to be worrying about gels, energy drinks etc etc during a training run. If you are to try marathons and above then there are nutritional needs to deal with during a race,
Personally, I find the more you read in this area, the more confusing it gets, and there is always someone prepared to sell you the new recovery drink, energy bar, gel, fat burner etc etc .....
Porrige, milk, banana, Over and out.