The Kennedy cup should be filled no further than the narrow section so that the liquid doesn't seep out of the straw hole when horizontal.
Kennedy Anti Spill Cup/Drinking Aid for Mobility Issues, Elderly & Less Able
Spill Proof Anti Spill Kennedy Cup Drinking Aid
Kennedy Cup Spill Proof Drinking Aid With Lid Straw & Handle
Anti Spill Non Tip Tumbler Non tip Anti Spill Adult Feeding Cup Drinking aid
