The ornamental design for a portable waterbottle with food container for pets, as shown and described.
FIG. 1 is a perspective view of a portable water bottle with food container for pets, showing my new design;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a left side elevational view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken lines shown in the drawings illustrate portions of the portable water bottle with food container for pets that form no part of the claimed design.