The ornamental design for a barrel-shaped bottle, as shown and described.
FIG. 1 is a front isometric view of the barrel-shaped bottle of the present invention;
FIG. 2 is a front view of the invention of FIG. 1;
FIG. 3 is a side view of the invention of FIG. 1 as seen from a left side of FIG. 2, wherein the right side view is substantially identical to the left side view, the only difference being the positions of the dashed labels; and,
FIG. 4 is a top view in elevation of the invention of FIG. 1.
The broken line showing is for illustrative purposes only, and forms no part of the claimed design.