Battery Operated Blender Jimmy Buffet How Do You Keep Fruit Cold Without A Fridge?

How do you keep fruit cold without a fridge? - battery operated blender jimmy buffet

I'll put a blender with the batteries in my locker so I can have smoothies for breakfast, but you do not know how I keep my fruit cold without a refrigerator, and my closet is not big enough for a mini-fridge.
PS there is no electrical outlet nearby.