what to add to the christmas tree water

*I look around, my ears perking up as I hear you say those words. It's as if I've been waiting for someone to ask me that question, and now that it's finally been said, I have a suggestion.* Well, what about some peppermint oil? It's a festive addition to any water, and it can also add some extra sparkle to the tree. Or you could even try using some rosemary sprigs, they'll look pretty and smell great! What do you think?