I think you are much more likely to have hydration issues than run out of gas.
I toured in the 80s; before power bars and energy drinks. Gatorade was about the only sports drink. I didn't like the taste.
I survived long rides on a 50/50 mix of water and apple juice. As for food, I kept baggies full of fig newtons, and bananas, apples whatever appealed.
During a ride, I kept stocking up as I went. I wouldn't pass up many roadside fruit stands when they were in season.
I did bonk one time during a ride from Ottawa to Montreal. About 2/3 of the way, on a very hot day, I ran out of gas, and found a corner store with litre bottles of Orangina. It was about 45 minutes before I was able to get going again.
Of course evenings were full of carb loading dinners.