Valving for a refillable reusable mixer bottle

A mixing and dispensing apparatus comprising:

• a first chamber capable of holding a liquid;
• a replaceable deformable second chamber capable of holding a liquid;
• and
• valve means between said first and second chambers for maintaining separation between the contents of said first and second chambers, said valve means including first and second, oppositely oriented one way valve members;
• wherein said first valve member, in response to increased pressure in said second chamber, allows the introduction of the contents of said second chamber into said first chamber;
• and
• wherein said second valve member, in response to decreased pressure in said second chamber, allows the introduction of ambient air into said second chamber to equalize the pressure therein.