A person should eat energy bars and they should eat energy drinks because it supplies a good amount of carbohydrates (sugar) that can quickly convert inside your body to energy.
(Some good examples of energy drinks would be the brand 'Gatorade')
I am not so sure what exact brand of energy bars to eat, but I know for a fact that each energy bar contains carbohydrates, so probably any energy bar would work. :)
↑ ↑ ↑ Hope this helps! :D