A separate bottle cap comprising a bottle body connector (1), an outer cap (2), an anti-backflow assembly (3) and an inner cap (4), wherein the bottle body connector (1) is a hollow cylinder, a lower end thereof is fit and connected to a bottle body, the anti-backflow assembly (3) is provided between the bottle body connector (1) and the inner cap (4), a lower end of the outer cap (2) is sleeved on the anti-backflow assembly (3) and locks an inner wall of the bottle body connector (1), and the outer cap (2) is provided on the inner cap (4), wherein the anti-backflow assembly (3) comprises a piston anti-backflow water blocking member (31) and a water sealing connector (32), and the piston anti-backflow water blocking member (31) is movably connected with the water scaling connector (32).

A separate bottle cap comprising a bottle body connector (1), an outer cap (2), an anti-backflow assembly (3) and an inner cap (4), wherein the bottle body connector (1) is a hollow cylinder, a lower end thereof is fit and connected to a bottle body, the anti-backflow assembly (3) is provided between the bottle body connector (1) and the inner cap (4), a lower end of the outer cap (2) is sleeved on the anti-backflow assembly (3) and locks an inner wall of the bottle body connector (1), and the outer cap (2) is provided on the inner cap (4), wherein the anti-backflow assembly (3) comprises a piston anti-backflow water blocking member (31) and a water sealing connector (32), and the piston anti-backflow water blocking member (31) is movably connected with the water scaling connector (32).

A pourer installable on a container for pouring a liquid from the container, the pourer includes a liquid flow channel configured to permit a flow of the liquid in an outflow direction; an air intake channel; a filter at the air intake channel. The liquid flow channel may includes a first portion, a second portion, and a third portion; wherein the flow of the liquid the first portion is configured to direct the liquid to flow towards the outflow direction, the second portion is configured to direct the liquid to flow towards a direction opposite the outflow direction, and the third portion is configured to direct the liquid to flow towards the outflow direction. The pourer may include a non-return valve at the air intake channel.