Many people choose to add something extra to their Christmas tree water to help it stay hydrated and vibrant. Some popular options include floral preservatives, which contain nutrients and a special anti-bacterial agent that can help keep the tree healthy and fresh. Other people like to add a splash of sugar or honey to their tree water, as these can provide extra energy and nutrients to the tree. Some even add a little bit of vodka or other spirits to keep the tree water clean and free from bacteria. Whatever you choose to add to your Christmas tree water, make sure it's something safe and non-toxic that won't harm your tree.