When it comes to watering your Christmas tree, you have a few different options for the type of liquid you can use. One popular choice is plain water, which is the cheapest and easiest to use. You can also add some household ingredients such as lemon juice, sugar, and even an aspirin to help keep your tree healthy and vibrant. Another option is to use a special tree-preserving formula, which can help to extend the life of your tree. Whatever you decide to use, make sure to check the water level regularly and top up if needed.