|Nalgene Grip-n-Gulp Kid Water Bottle|
We love our Nalgene Tritan Grip-n-Gulp kid’s suppy cup. It’s the perfect size, comes in fun colors, and WILL NOT LEAK, even if you shake it upside down. It comes with a flexible, removable, rubber valve inside the lid which keeps it leak- and spill-proof — you should take it out for cleaning, and you can take it out if you no longer want it to be spill-proof (not sure why you’d want to do that — maybe to teach your kid a lesson in physics?).
P.S. You can get an almost-matching leak-proof Nalgene On the Fly water bottle for yourself — hey, even grownups spill sometimes!