I cut soda out of my diet years ago almost completely...I say "almost" because before TTC I may have had a Dr.Pepper once in a blue moon if I was at a party or something, but never had them in my house. Now that we are TTC I won't touch any soda but caffeine free ginger ale once in a while.
I never drank more than 2 cups of coffee since I started drinking it (been drinking the 1/2 caffeine coffee for about 3 years now), and I am definitely not addicted to it by any means. Since we started TTC I went down to 1 cup of 1/2 the caffeine coffee a day, and no more.
My OBGYN told me it was fine to have up to 2 cups of coffee a day so I feel that having my 1 cup of 1/2 the caffeine coffee is not harming me. Oh, and I do not drink tea and do have chocolate once in a while...