The ornamental design for a drinkholderstand, as shown and described.
FIG. 1 is a perspective view of a drink holder stand showing my new design;
FIG. 2 is a front plan view thereof;
FIG. 3 is a back plan view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
In the drawings, the broken lines represent unclaimed environment subject matter and form no part of the claimed design. Likewise, the dash-dot-dot lines represent boundary lines that form no part of the claimed design.