The ornamental design for a waterbottletopcover, as shown and described.
FIG. 1 is a side elevation view of a water bottle top cover, showing my new
design, the broken lines showing of a water bottle is for illustrative
purposes only and forms no part of the claimed design;
FIG. 2 is a side elevational view showing a different position of use, the
broken lines showing of a water bottle is for illustrative purposes only
and forms no part of the claimed design;
FIG. 3 is a left side elevation thereof, the right side is a mirror image;