Place it in a Christmas tree stand and water it whenever the level of water gets low.
water
water? LOL
Your Christmas tree may not be drinking water because the bottom of the tree trunk has dried out and formed a seal, preventing water absorption. This can happen if the tree was not freshly cut before being placed in water.
Yes, you have to water a real Christmas tree or it will dry out, which causes the needles to fall off, and it becomes a fire hazard.
Yes, you can plant a Christmas tree in your backyard as long as the tree species is suitable for your climate and the tree has enough space to grow properly.
Yes, most tree lots are open on Christmas Day. Even better, you will likely get a discount on your tree because you waited so long.
it dies
Your Christmas tree may not be taking water because the cut at the base of the tree has dried up and sealed, preventing water absorption. It's important to make a fresh cut at the base of the tree before placing it in water to ensure proper hydration.
When you get your tree home and before you bring it inside, cut at least 1 inch on a small slant off the bottom. This creates an open "wound" that the tree can take water through. As long as you keep the bottom of the tree and the entire cut area filled with water, you should get a good, solid month out of the tree before it starts to dry out and lose its needles.
As a whole, that and the tree holding mechanism are called the 'Christmas tree stand'. When referring to the unit individually you can call it a 'tree stand water dish', though I've also heard it called tree pan, tree dish, or tree feeder.
There are a wide range of Christmas tree bags but there does not seem to be a specific popular design. The typical Christmas tree bags are a round long duffel type bag that is large enough to hold a tree.