Oh, you're welcome to add any sort of water you like to the tree! Some people like to add a bit of sugar or honey to the water to help keep the tree hydrated and healthy. Or you can try using a specialized tree preservative solution, which can help keep the tree looking fresh and green throughout the holiday season. The key is to keep the water level high and make sure the tree has enough water to stay hydrated. And don't forget to check the water level every day!