As has been said, you really need to experiment and find what suits you personally. I didn't get on with dried fruit; chewing, breathing and running all at the same time was too much for me. I found jelly beans difficult to handle when I was hot, and they'd got a bit melty in my pocket. Lucozade gels were disgusting, but I settled on SIS blackcurrant and the SIS Go gel, which has caffeine in them.