What happens if you stop putting money on your debit card?

I have been using my debit card for a while now but now that I am on summer break with no job, no money is flowing in. What would happen to my account if I have a 0 account balance in savings and checking account?|||If your accounts were not free student checking and savings accounts then there will be a monthly fee that will hit each month, putting it in a negative balance. Call them and find out what type of account you have to make sure you will NOT be charged a monthly fee, if so, close the account.|||Nothing