Simply screw off a bottle lid and then push the pourer into the bottle. If your bottle has a wide mouth, then you'll have to buy a wide pourer.
Source: wiktionary
Pourer
Synonyms for "pourer"
Ranked by relevance and common usage.
Sample sentences
2 total sentences available.
The visitor then passes the cup to others who are present. Each person takes a sip, handing the cup back to the pourer.
Source: wiktionary