Glass Bottle

The Glass Bottle is a new item planned to be added in the 1.9 update. Glass Bottles are used to brew potions and Splash Potions with various effects. It is possible to pick up water for potions in the 1.9 Pre-Release 3. You can put them in the Brewing Stand; however, potions cannot be created unless they are filled with water. You can put in various things to make different potions.

The bottles also could be filled with a Cauldron; you right-click on a cauldron with a glass bottle in your hand. the bottle will be filled and 1/3 of the water in the cauldron is taken out. To fill the cauldron, you have to right-click with a bucket of water on it. The water in the cauldron moves, but you won't see or hear splashes when you step in it. Using a Cauldron is very inefficient and is not recommended. This is because you can get infinite uses out of a single water source and you are limited to three uses with a cauldron, before having to refill the cauldron with a bucket of water. Furthermore the use of a cauldron is much more expensive as you need to craft both a bucket and the cauldron itself. This uses up ten iron ingots, and a cauldron will not help you for anything else in any other way.

History
The Glass Bottle was first added in the Beta 1.9 Pre-Release 2. They were given an additional function for picking up water for potions in the Beta 1.9 Pre-Release 3.