Abstract: Provided in various example embodiments is a system and method for converting beverage containers with removable lids into spill-resistant sippy cups, optionally comprising a punch mechanism comprising a die handle connected with a die and pivotably connected with a punch handle connected with a punch that is positioned opposite the die, the punch and die operable to punch holes through upper surfaces of beverage container lids having longitudinally extending sides, such that the holes have a first cross-sectional size, shape, and area. Also provided are drinking straws each having a second cross-sectional size, shape, and area, the second cross-sectional area being less than the first cross-sectional area by a differential area sufficient in size and shape to allow the passage there through of air but not more than a few drops of a liquid beverage.