an apparatus configured for displacing fluid from a fluid container comprises first and second actuators configured to be movable together until the first actuator compresses a first part of the fluid container and then moveable independently until the second actuator compresses a second part of the fluid container . fluid containers comprise a first vessel , a second vessel , and a sealing partition preventing fluid flow from the second vessel and further include piercing means for piercing the sealing partition to permit fluid flow from the second vessel . a fluid container comprises a vessel configured to be collapsed to displace fluid from the vessel , a housing surrounding at least a portion of the vessel , and a floating compression plate movably disposed within the housing and configured to permit an external actuator to press the compression plate into the vessel to collapse the vessel and displace the fluid contents therefrom .