Easy to pack carbs, which will supply quick energy and are readily absorbed, along with helping to replace some potassium, are the same ones I take while on extended bike rides. So my suggestions are raisins/dried apricots.
If you tend to get hungry, a small amount of peanuts/almonds would be a good choice.
For liquid, just bring purified/bottled water (not artificially sweetened).
Think of food as fuel for the body instead of feeding emotions