Wash out all empty wine and beer bottles and allow to dry overnight.
Stain or paint all wood pieces. Allow to dry overnight.
Cut the 4-by-4-inch post to the desired height. Using the drill, make holes for the dowels. Drill the holes on an angle to provide a more tree-like appearance after you assemble the bottle-tree.
Mix the bag of quick-setting concrete in the bucket, following the manufacturer's instructions. Set the post into the concrete and allow the concrete to set.
Cut the dowels to desired lengths. Cut to differing lengths to give your tree a more realistic appearance.
Use wood glue and insert the dowels into the holes on the post. Allow the dowels to set.
"Plant" your tree by digging a large hole. Set the bucket in the hole and cover with dirt.
Carefully place bottles on the ends of the dowels. Bottles of colorful, assorted colors create a more authentic-looking tree.