Ruling on drinking from the mouth of the bottle
Question

                Can the prohibition on drinking from the mouth of the waterskin be applied to drinking from the mouth of the bottle?.
Praise be to Allah.
    It was proven that the Prophet (blessings and peace of Allaah 
    be upon him) forbade drinking from the mouth of the waterskin. Narrated by 
    al-Bukhaari (5628) and Muslim (5629) from the hadeeth of Abu Hurayrah and 
    Ibn ‘Abbaas (may Allaah be pleased with them). 

    The siqa’ (translated here as waterskin) is the vessel in 
    which water is put and it has a mouth from which it is drunk. 

    The scholars (may Allaah have mercy on them) mentioned a 
    number of reasons for this prohibition: 

    1.

    That what is inside the waterskin cannot be seen, and there 
    may be an insect or snake inside it which could cause harm or annoyance, as 
    it was narrated that a man drank from the mouth of the waterskin and a snake 
    came out of it. 

    This reason does not apply with regard to drinking from 
    bottles nowadays, because what is inside them can usually be seen. 

    2.

    That the person who drinks from the mouth of the waterskin 
    may not be able to control the flow of water, so he will get more than he 
    needs and it will choke him or make his clothes wet. 

    This reason does apply with regard to those who drink from 
    bottles, as we see happen with a lot of people. 

    3.

    The prohibition is there so that his saliva will not get on 
    the mouth of the bottle or be mixed with the water inside it, or so that his 
    breath will not get on the mouth of the bottle and thus put others off. This 
    may be a cause of the spread of disease. 

    This reason is also applicable to those who drink from 
    bottles, but it applies to the one who touches the bottle with his mouth. 
    But if he pours from it and does not touch it with his mouth, there ts 
    nothing wrong with it. 

    Similarly, it applies in cases where someone else will drink 
    from the same bottle after him. But if the bottle is just for him, there is 
    nothing wrong with drinking from its mouth in that case. 

    It is not unlikely that the prohibition on drinking from the 
    mouth of the waterskin was for all of these reasons, as was stated by Ibn 
    al-‘Arabi, Ibn Abi Hamzah and others (may Allaah have mercy on them). 

    See Fath al-Baari, commentary on hadeeth number 5628. 

    Some of these reasons, as stated above, apply to the one who 
    drinks from a bottle, hence he should not drink from its mouth, especially 
    if someone else is going to drink from the bottle too. 

    And Allaah knows best.