Bananas & Apples have minimal "crumbs" and no wrappers. Dispose thru the canopy wind vent.
Water is less corrosive if you spill it than Coke, orange juice, Gatorade or Red Bull type energy drinks.
Pilots who have left just a few granola or energy bar crumbs in their cockpits have found mice droppings, chewed electrical wire or gnawed cushions and parachute cases, often on the next day.
Peanut butter? That what many folks use on mouse traps.
Mice love chewing on the drinking valve of your Camel-Back water bag. Yuck. Apparently they can smell water.
Next, they decide that your glider is a good place to build a nest under your seat pan or in the fuselage or wing.
Note: IN THE CRITTER FOOD-CHAIN, MICE ATTRACT SNAKES!
Ask me how I know!