Is a cup of coffee 5 days out of the week and two cans of coke 5 days a week too much caffeine?

No. Many people drink several cups of day. The amount of caffeine in a can of coke is less than in a cup of coffee.

However, it is a good idea to add some water to the amount of fluid you drink during the day - and your teeth as well as your body might benefit from less sugary beverages being traded with fresh water ;)