Glass bottle
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Glass bottles can be filled to make water bottles, which can then be used to brew items with a brewing stand. Glass bottles are also used to hold the resulting potion.
A bottle may be filled by holding it in your hand and using on a water source block or a filled cauldron. If filled via a water source, the water will be unaffected. If filled via a cauldron, 1/3 of the water in the cauldron will be removed. Therefore, using a cauldron to fill bottles is inefficient, except in the Nether where it is normally the only way to fill bottles. Though the cauldron nor the brewing stand have been added in mineblocks.