The ornamental design for a label for a bottle, as shown and described.
FIG. 1 is a front elevational view of a label for a bottle showing my new design;
FIG. 2 is a top plan view, the bottom plan view being identical thereof;
FIG. 3 is a left side elevational view, the right side view being identical thereof; and,
FIG. 4 is a perspective view of the label for a bottle shown in an alternate configuration.
The portion of FIG. 4 shown in a light coarse dot pattern and outlined in dashed lines of the label for a bottle is for the purpose of illustrating environment, and forms no part of the claimed design.