This may sound corny, but I save my codes for a day such as this. A while back, on a different day when My Coke Rewards was having a similar promotion, I decided to start saving my codes in a spreadsheet to maximize my reward values. So, today, I was able to put in 10 codes (the max allowed for a single day) and get double points for all of them.
Not familiar with My Coke Rewards? Go here to read more. It's an easy way to turn the money you spend on Coca-Cola products into future savings.