We claim the ornamental design for a “countertop drinking water system,” as shown and described.
FIG. 1 is a right front top perspective view of the “countertop drinking water system” according to the present invention;
FIG. 2 is a left front top perspective view of the “countertop drinking water system” according to the present invention;
FIG. 3 is a right front bottom perspective view of the “countertop drinking water system” according to the present invention;
FIG. 4 is a left front bottom perspective view of the “countertop drinking water system” according to the present invention;
FIG. 5 is a front view of the “countertop drinking water system” according to the present invention;
FIG. 6 is a rear view of the “countertop drinking water system” according to the present invention;
FIG. 7 is a right side view of the “countertop drinking water system” according to the present invention;
FIG. 8 is a left side view of the “countertop drinking water system” according to the present invention;
FIG. 9 is a top view of the “countertop drinking water system” according to the present invention;
FIG. 10 is a bottom view of the “countertop drinking water system” according to the present invention;
FIG. 11 is an exploded left front bottom perspective view of the “countertop drinking water system” according to the present invention with Cartridge removed for ease of illustration;
FIG. 12 is an exploded right front bottom perspective view of the “countertop drinking water system” according to the present invention with the cartridge removed for ease of illustration;
FIG. 13 is an exploded right front top perspective view of the “countertop drinking water system” according to the present invention with the cartridge removed for ease of illustration; and,
FIG. 14 is an exploded left front top perspective view of the “countertop drinking water system” according to the present invention with the cartridge removed for ease of illustration.