why isn't my christmas tree drinking water

Your Christmas tree isn't drinking water because it's a tree, not a human being. Trees absorb water through their roots, not through their branches. If your Christmas tree is not getting enough water, it may be because it's in a dry environment or it's not getting enough light. Try moving it to a more humid place or giving it more sunlight to see if that helps. Additionally, you can try watering the tree from the bottom up instead of pouring water directly on the branches.