A Christmas tree, while not a living being, requires water to stay hydrated and healthy. To provide water to a Christmas tree, you can fill the base of the tree with water and add an additive to help keep the water fresh and prevent bacteria growth. Additionally, you can wrap the base of the tree in a damp cloth to help the tree absorb water. Keep in mind that you should only give a Christmas tree as much water as it needs, as over-watering can cause the tree to rot and become weak.