Endless water magic trick - inexhaustible bottle

OK this is a very old illusion, just remodeled into modern day bottles (Wine & Beer).

This is sometimes referred to as the Lota bowl, Inexhaustible Bottle, Assassin's Teapot, etc

It consists of a dual wall bottle, where some of the water is trapped in the outer vessel, 

when tipped out it looks like it has all gone, but when you invert the bottle back to the 

correct orientation the center compartment fills.

There is a breather that you cover with your thumb or finger when pouring the water out

to hide that water is in the outer vessel & release when the bottle is up the right way to allow

water to drain from the outer vessel to the inner vessel to release more water.

It's a good old trick, great for the kids to play with as shown in the animated gif