The ornamental design for a decorativebottle, as shown and described.
FIG. 1 is a front elevational view of a decorative bottle of the present invention, the broken line showing is for illustrative purposes only, and forms no part of the claimed design;
FIG. 2 is a top view of the bottle of FIG. 1;
FIG. 3 is a bottom view of the bottle of FIGS. 1-2; and,
FIG. 4 is a front view of another embodiment of the bottle of the present invention.