The Soda package is well worth doing,i did it on the Freedom last Oct as long as you make sure you get it filled maybe twice a day you will benifit.Its so easy to do that too,if your laying around the pool and its a hot day then it is very easy to drink so much liquid.I always made sure i filled up before we went to bed..that way you have a drink through the night should you need one.Enjoy your cruise...........