The invention provides a hydration apparatus comprising: (a) a retaining tube having a distal and a proximal end, comprising: (i) a removable plunger adapted for insertion into said retaining tube proximal end, wherein said plunger includes a base (ii) a cap at said retaining tube distal end (iii) a chamber formed by the space between said plunger base and said cap and (iv) a side port having a valve, wherein said side port is located towards the distal end of said retaining tube and said valve allows for the passage of a material into said chamber and may also allow for the passage of fluids out of said chamber or the selective passage of solid materials and (b) a hydrating tube having a distal end and a proximal end, comprising: (i) a connector for attachment to said valve located at said hydrating tube distal end and (ii) a substantially closed cover at said hydrating tube proximal end. The apparatus is useful in forming a composition for application to a bone surface of a human or animal subject. A method of hydrating a formed bone composition using the apparatus is also provided.
