It took a while to work out the kinks, but my diet is pretty much set for the trip.
If I'm at a host's house, I eat whatever they feed me for breakfast. This is typically eggs, bagels, toast, yogurt, fruit, normal breakfast food. If not, I'll use my camping stove to cook instant oatmeal.
Breakfast #2 usually comes at 10 am after the first couple hours of riding. This entails 2 pb and honey sandwiches, dried fruit, and some milk or juice from a grocery store or a gas station.
Noon: 10 min break for clif bar or lara bar. I love lara bars...
Lunch is around 3. Usually this is some baked beans with bread and more dried fruit, but sometimes I go to a fast food joint. No, the food isn't particularly good for you, but it's calorie-rich and places like McDonald's have free WiFi so I can check the route and write posts like this.
Through experience and conversations with other cyclists, I can confirm that it honestly doesn't matter a whole lot what you eat on the road, as long as it's not something like potato chips for days. Everything eventually goes in the burner. I think of Dora the Explorer's backpack, the one that gobbles up all the items Dora didn't choose.
After lunch I keep my blood saturated with clif bars and gatorade until I arrive at my destination.
Dinner with a host is when I get the best-quality food. This is when I can fill up on whole grains and vegetables. Either way, I've been taking a multivitamin every morning just in case I get... scurvy or something.
Note about fast food: No Taco Bell, no exceptions. It will screw you over later with a bumpy ride on the porcelain bus.