I try to use cash as much as I possibly can. It is no ones business to track what I buy, when I buy it, how often I buy it, etc. In the event of an emergency (e

I try to use cash as much as I possibly can. It is no ones business to track what I buy, when I buy it, how often I buy it, etc. In the event of an emergency (environmental, energy, etc), how do you propose using a credit card to purchase anything? The biggest problem I face is tellers that can no longer do simple math and have problems counting.