The invention relates to an
aroma diffuser, for a disposable
water bottle, in particular a disposable plastic
water bottle, with a capacity between 0.2 and 2 liters, and comprising a neck (4) surrounded by a thread (40) for a
screw cap (3) and by a collar (41) located below the thread (40) of the neck (4), comprising: an
aroma reservoir (5), such that this
aroma reservoir (5) and / or the diffuser (2) is or are partially annular in shape, making between 60% and 90% of a complete turn, so as to be able to clip around the neck (4) of this
bottle (1), below the collar (41) of the neck (4) of this
bottle (1), and comprising several aroma
diffusion orifices (6), a closure (7) for the reservoir (5), movable, relative to the reservoir (5), between: a position of simultaneous closure of all these orifices (6), preventing the
diffusion of aroma outside the reservoir (5), and a position of simultaneous opening of all these orifices (6) allowing the
diffusion of aroma outside the reservoir (5), around the neck (4) of this
bottle (1), towards the top of this bottle (1). Figure for the abbreviation: Figure 1.