The ornamental design for a waterbottle, as shown and described.
FIG. 1 is a perspective view of a water bottle showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a right side elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 an exploded perspective view thereof showing the cap, bottle and handle separated.
The broken lines in the drawings showing of the water bottle illustrate the portions of the water bottle that form no part of the claimed design. The shaded surfaces adjacent the broken lines represent the bounds of the claim.