Marshmallows & coke

ok...now tell me why I spend 100's of dollars on healthy, but good food, just to find out my son would rather eat marshmallows dipped in Coke! I'm getting a vivid picture here of how my son's eating habits will be in college! So I'm guessing instead of buying a meal ticket at the University of Texas, I should invest in marshmallows! Do they spoil? I know they get hard if left opened...great, now I'll have to buy Rubbermaid to store the marshmallows in! This gets better and better. The saga of a single mom surviving a teenager continues!