That's a very good question. Here are some tips for watering a Christmas tree:
1. Make sure to use a stand that has a water reservoir. This will ensure that the tree stays hydrated throughout the holiday season.
2. Check the water level daily, and add more if needed. The tree should be able to drink at least one quart of water per day.
3. If the tree is starting to dry out, don't hesitate to add more water. A dry tree can be a fire hazard, so it's important to keep it well hydrated.
4. Make sure to change the water regularly, at least once a week.