I claim the ornamental design for a bottle handle attachment, as shown and described.
FIG. 1 is a perspective view of the bottle handle attachment;
FIG. 2 is a front side view thereof;
FIG. 3 is a rear side view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a top side view thereof;
FIG. 7 is a bottom side view thereof; and,
FIG. 8 is a perspective view of the bottle handle attachment shown in an environment of use.
The broken lines depict a water bottle, lid, and rope handle which represent environment and form no part of the claimed design. Additionally, the broken lines depict portions of the bottle handle attachment and form no part thereof.