Abstract: Cap for bottle for rinsing nose, suitable for standard water bottle. The device comprises a body portion to be attached to the top of the bottle, comprising a cylindrical void for the threaded portion of the bottle, and one-way fluid valve attached to a void extending from the cylindrical void through the body portion. The body portion also includes one-way air valve to allow the entry of air into the bottle because of the negative pressure in it. A top portion is removably or openably attached to the body portion, comprising tubular opening starting near the body portion and extending through the top portion, wherein the top portion is configured so that it has a tip to be contacted with the user's nasal cavities and the top portion has as pressure zone for closing the fluid fluid valve by applying a pressure to said pressure zone.