I'm only familiar with 25km rides yet. Ride to work and back.
Though I have decided to upgrade my scheme by doing longer rides as well. Maybe 50km, 75km, 100km.
I just don't have a clue what to bring on those kinds of rides when it comes to food. My 25km ride into work and back I don't eat at all. During the summer I take a few sips of water as it might get too warm, but that's it.
Anyone can enlighten me on what to eat during these longer rides?