Bottle for extemporaneous-preparation products, particularly medicinal, pharmaceutical, cosmetic products or the like, comprising: - at least a tank for the containment of a first substance, which has at least a neck ending up into a dispensing mouth; - at least a blistered capsule (7, 8) for the containment of a second substance, which comprises: - a first foil deformable and shaped to define a containment cavity of said second substance and a perimeter edge, and - a second foil breakable and flat, which is associated with said perimeter edge to close said containment cavity; said blistered capsule (7, 8) being placed in the proximity of said neck, wherein the inner volume of said blistered capsule (7, 8) is temporarily separated from the inner volume of said tank and can be placed in communication with it for mixing the first substance and the second substance together to form a product; and - at least a removable cap, which is associable with said tank to cover said dispensing mouth and which comprises at least an actuator element moving between a packaging configuration, wherein said actuator element is kept spaced from said blistered capsule (7, 8), and a release configuration, wherein said actuator element is arranged in contact against said blistered capsule (7, 8), causing the opening thereof for the exiting of the second substance and its mixing with the first substance to form said product; characterized by the fact that: - said cap comprises an annular wall having an outer side surface and an annular edge with which said perimeter edge of the first foil is associated; and - said neck comprises an end portion having an inner side surface and an annular seat; said annular wall being insertable into said end portion with said outer side surface in sealing contact against said inner side surface and said blistered capsule (7, 8) fitted between said annular edge and said annular seat, wherein at least one part of said outer side surface is oversized with respect to said inner side surface and said annular wall is insertable into said end portion with interference. - at least a tank for the containment of a first substance, which has at least a neck ending up into a dispensing mouth; - at least a blistered capsule (7, 8) for the containment of a second substance, which comprises: - a first foil deformable and shaped to define a containment cavity of said second substance and a perimeter edge, and - a second foil breakable and flat, which is associated with said perimeter edge to close said containment cavity; said blistered capsule (7, 8) being placed in the proximity of said neck, wherein the inner volume of said blistered capsule (7, 8) is temporarily separated from the inner volume of said tank and can be placed in communication with it for mixing the first substance and the second substance together to form a product; and - at least a removable cap, which is associable with said tank to cover said dispensing mouth and which comprises at least an actuator element moving between a packaging configuration, wherein said actuator element is kept spaced from said blistered capsule (7, 8), and a release configuration, wherein said actuator element is arranged in contact against said blistered capsule (7, 8), causing the opening thereof for the exiting of the second substance and its mixing with the first substance to form said product; - said cap comprises an annular wall having an outer side surface and an annular edge with which said perimeter edge of the first foil is associated; and - said neck comprises an end portion having an inner side surface and an annular seat;