DIY Miniature Sippy Cup [really works] 

Make a miniature sippy cup that really works
DIY mini sippy bottle
You can use either saline solution bottle from a pharmacy or eye drops - many of these bottles are over the counter and cheap and great for crafting.
DIY Miniature working Sippy Cup with Liquid Inside
Music by:
On the Bach - by Jingle Punks
To the Top by Silent Partner