My stomach isn't overly fussy, so I can eat most things during a long ride. Bananas, watermelon, peanut butter and jelly sandwiches,dried fruit, nuts, bagels, etc. I do tend to carry Cytomax sport drink, which does contain sugar. I especially need it in the heat or when the ride is long enough that my stomach does start to fuss, e.g., the RAIN ride. I think you have plenty of time to experiment with what works for you.
Live with intention. Walk to the edge. Listen hard. Practice wellness. Play with abandon. Laugh. Choose with no regret. Continue to learn. Appreciate your friends. Do what you love. Live as if this is all there is.
--Mary Anne Radmacher