I try to only drink water, purified..nothing from the tap, and when I get burned out on water I usually drink AZ green tea or
hansen natural which is kinda like a healthy soda you could say.
Try putting some lemon slices into your water if you get tired of drinking it so much, good change of pace.
After about 2 weeks of not drinking soda you won't crave it much at all anymore and when you ever do take a drink of it it won't taste as good, at least for me anyway.