The ornamental design for a waterdispenser with tank, as shown and described.
FIG. 1 is an overhead isometric view of the front, right side and top of a water dispenser without tank showing my design.
FIG. 2 is a front elevational view thereof.
FIG. 3 is a top plan view thereof.
FIG. 4 is a back side elevational view thereof.
FIG. 5 is a bottom plan view thereof.
FIG. 6 is a left side elevational view thereof; and,
FIG. 7 is a right side elevational view thereof.
The broken lines showing portions of the water dispenser with tank are for the purpose of illustrating environmental structure and form no part of the claimed design.