I used to work for one of Culligan's competitors, (I wish I had THEIR ro unit!)and the only additive we put in the water was ozone. If it's just plain water, not spring water, etc. you should be ok, but contact them anyway just to be sure. They should tell you what's in there, especially if you tell them what it's for. Also, be sure to ask if it's ro water or just filtered.
Aaron