fused together to form the container optionally additional internal structure e g rigid or semi rigid tubing or the like may be provided to facilitate fluid flow to and from each chamber in an integral container in which fluid is to be delivered by compression of one or more chambers it is preferred that the conduit through which fluid exits such a chamber lies outside of the compression region i e the region to which pressure is directly applied by contact with a pressure applying structure in the pump apparatus in this manner mixing of residual medications in the conduits with subsequently administered medications from other chambers can be minimized alternatively the conduits may lie within the compression region particularly if mixing is not a concern if the conduits are constructed by leaving unbonded channels in the integral container the conduit will have a generally flat shape but enlarges to have a more tubular shape upon the application of pressure to the corresponding chamber the shape of the conduit depends on the strength of the materials used to construct the integral container and the pressure of the fluid therein specifically less flexible material may require greater pressure for enlarging the conduit advantageously the textured inner surface of at least one side.