You need to eat and drink before, during, and after your ride. I don't know where you got the 90-minute refueling info, but that's plain wrong.

Do a search on eating and drinking and nutrition here and you will find lots of useful information.

At the very least you should be drinking a bottle of water before your ride, a big swig every 10-15 minutes or less (depending on terrain, weather, and you), and a recovery drink or water after your ride. Eat something every 30 minutes. Adjust according to your needs.

Stay hydrated and well-nourished (not junk) all the time, not just when you are riding. You can't have fun if you feel bad, and the whole point of riding a bike is to have fun and feel good!