I kinda like gum better, gives one something to do and for me lasts longer than the candy. If I go with candy it is Jolley Ranchers. They last longer because the are semi-permanently stuck to your teeth!
I remember one time, out in the fields behind our house, before development paved over everything in so cal, when I was saddled with my little brother. He was whining about being thirsty and wanting to go home, so I told him the ol' Davy Crockett "suck on a rock" thing. Then I picked up a dirt clod and gave it to him. He ran home wailing with mud running down his chin. Yeah, I got beat for that one, too.
Candy/gum it doesn't matter. Something to do when your not doing anything.
As far as the trail mix goes, try this GORP recipe my wife makes for me.
Peanut Butter Chips
(When at home she will throw those lil marshmellows in there, but if you keep the GORP for any lengthy amount of time, the texture of them turns chitty.)