The ornamental design for a dualsidedbottle, as shown and described.
FIG. 1 is a first side view of a dual sided bottle, wherein the opposite side view is a mirror image of the first side;
FIG. 2 is a second side view of the dual sided bottle wherein the opposite side view is a mirror image of the second side; and,
FIG. 3 is an enlarged top plan view of the dual sided bottle, wherein the opposite side view is a mirror image of the plan view, the broken lines in the drawings depict portions of the dual sided bottle that form no part of the claimed design.