Lil Debbie mini donuts are $0.003 per calorie and provide lots of sodium, fat, and carbs. Fats are really not so important for short rides but are helpful to some athletes on longer rides. Just open one end, put one or two in your mouth every 10-15 minutes. Chew well. Drink water.
Or, one can buy Scratch Superfule and stick 500-600 calories in a water bottle and drink that every 90 minutes.
Better yet, after about 150 miles stop and buy 2 quarter pounders, 2 apple pies, and a large vanilla shake. That will fuel you well into the night.
Most important. Only put into your month want you really want to eat.