A hand-actuated container used for mixing liquids contains a compression platform with release holes and walls with convolution areas. The convolution areas are convoluted when the container is in a state of compression. These features form a compressible cavity body that, when filled with liquid and compressed, push liquid at high pressure through a nozzle into a liquid reservoir. Vacuum backflow occurs through the release holes and the nozzle as the compressible cavity body returns to its original shape. In some embodiments, a double level platform allows a user to dial in the amount of backflow through the release holes.