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The correct answer is reusing of portable water bottles. Reusing portable water bottles is unsafe most disposable water bottles are made with lightweight polyethylene terephthalate, these bottles may pose some health dangers, although there is little scientific arrangement on how serious these risks may be. 
Reusing light weight polythene terephthalate water bottles may pose some health dangers. Most disposable water bottles are made with light weight polytheylene terephthalate. Reusing these bottles may pose some health dangers, although there is a little scientific agreement on how serious these risks may be. The mouth leaves a residue when one drinks from a bottle, and these bacteria may accumulate with repeated use. Disposable bottles also pose a risk to the environment. 

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