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A water bottle is a container that is used to hold liquids, mainly water, for the purpose of transporting a drink while travelling or while otherwise away from a supply of potable water.
Water bottles are usually made of plastic, glass, metal, or some combination of those substances. In the past, water bottles were sometimes made of wood, bark, or animal skins such as leather, hide, and sheepskin.
Water bottles can be either disposable or reusable. Disposable water bottles are often sold filled with potable water, while reusable bottles are often sold empty. Reusable water bottles help cut down on consumer plastic waste and carbon emissions. A reusable water bottle designed for outdoor activities is also called a canteen.It is not recommended to fill aluminium bottles with acidic liquids (e.g. orange juice), as this could cause aluminium to leach into the contents of the bottle. Depending on the type of source material and manufacturing process behind a stainless steel bottle, trace amounts of minerals can leach into contents from this type of bottle as well. Stainless steel bottles that do not contain a liner have been known to transfer a rusty taste and odor to contents. Bottles made with food-grade stainless steel do not transfer taste or odor.
Metal (especially steel) water bottles can be heavier than their plastic counterparts. Single-walled metal bottles readily transfer temperature of contents to external surfaces, which makes them unsuitable for use with unusually hot or cold liquids. Double-walled metal bottles are insulated to keep cold liquids cold and hot liquids hot, without the external surface being too hot or too cold. Because double-walled bottles have more metal in them, they are more expensive. They are typically vacuum-insulated, but some may have a solid or gel insulation between the metal walls.