Love the wide ranging suggestions, which I think reflect the wide range of experience. OP – you don’t say whether your on the road or MTB’ing, as although it shouldn’t technically make a difference to what you eat, it will impact the packaging you can probably deal with on the fly.
Doing the four hour Brass Monkey races I’m in full fingered, warm gloves, which hampers dexterity, so easy access it really important.
The tracks are mainly singletrack, so need to pick your moment and get it down you quick.
Also, anything solid becomes almost inedible if it gets too cold, so no bars or solid food.
I was towards to front of the field, so only wanted to stop to swap bottles.
I opted for isogels, and took one every 30-40 mins, as I carry plain water to counter the sweetness so gels were my only ‘food’.
In the summer, with warm temperatures, short fingered gloves, things are a bit easier, so the options open up.
You feeding option are determined by lots of things. How technical you want to be is only one factor…