Experiment with what you like.
I being a diabetic and have only 25-miles round trip to commute, and I do ride aggressively. In the morning my sugar count varies. I found that I am okay without morning snacks until I get to work and shower. Then I will eat something at my cubical to hold me over until lunch. On the way back I have to be careful because my sugar count is at it’s lowest around 4-ish about an before I head home and I find that taking in some water-downed juice as I get dressed for the trip back gives me the fuel needed to aggressively charge up the one major hill I have. I eat some carbohydrates around lunch when I take the long way home and ride with fellow co workers. That is when I use up a lot of energy without realizing it.
I do sip water about every 10 to 15 minutes of my commute. On hot days I use a lot of water.