Methods and apparatus for producing saline slush for surgical applications.Producing surgical saline slush in aslush bottle that is a rigid or semi-rigid, high integrity, sturdy containerthat resists punctures and leaks to better maintain a sterilebarrier and does not rely on having an external object placed in the fluid tomix the slush. Slush is agitated by rotating the slushbottle within a slush bottle carriage around an axis of rotation. Agitation ofthe slush may be increased by including an agitationfeature such as at least one fin in one or more sidewalls of the slush bottle.The rotating slush bottle is chilled. One variation is tokeep the sterile saline in a flexible container and tumble the flexiblecontainer in a rotating slush bottle. Other variations aresug-gested.