Skip the coke, Mountain Dew or anything with caffeine as much as possible. No artificial sweeteners, they aren't good for the baby. (No diet pop.) Too much sugar isn't good for the baby either, so try to mix in sips of unsweetened tea or chew on ice now and then (you can get ice pops or freeze juices or soup broth in ice cube trays). Peppermint, ginger and lemon are all natural anti-nausea ingredients to look for in teas, and they are all caffeine-free and safe for pregnancy.