Good question! When adding water to your Christmas tree, it's important to use only room temperature water, not too hot or too cold. You should also add a preservative such as a tree fertilizer or tree-care product to help your tree stay healthy and green. Be sure to check the water level daily and add more as needed to keep the tree hydrated. Lastly, keep your tree away from heat sources such as fireplaces, radiators, or direct sunlight to prevent it from drying out. With proper care, your tree will stay fresh and beautiful throughout the holiday season!