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.