Some of the foods you'd normally take for a picnic would work.
If you can take a small cooler with you, just pack some yogurt, cottage cheese, etc. You eat it with a plastic spoon, so you're not touching anything with your hands.
You can mix up some smoothies ahead of time and just keep them in a cooler in one of those hot/cold travel mugs.
Bananas are good. You eat out of the peel, so you're not actually touching it.
Hope this helps.
Have fun fishing!!!