I claim the ornamental design for a pill crusher pouch, as shown and described.
FIG. 1 is a front perspective view of the pill crusher pouch showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a right side elevation view thereof; and,
FIG. 6 is a left side elevation view thereof.
The broken line showing portions of the pill crusher pouch is included for the purpose of illustrating environmental structure and forms no part of the claimed design.