Fill a cupcake without a pipe bag
After the cupcakes are baked, use a melon baller to remove a piece of the center top of the cupcake. Reserve for later.  spoon filling into the hole, and place the top back on the cupcake and ice
After the cupcakes are baked, use a melon baller to remove a piece of the center top of the cupcake. Reserve for later.  spoon water into the hole, and place the top back on the cupcake and ice