There is disclosed a new self-rehydrating container for the production of solutions or suspensions substantially free or undesirable micro-organisms.The container is divided into at least two compartments by at least a non-permanent seal bonding the opposite walls of said container, the walls of the container surrounding at least a first compartment being watertight, the walls of the container surrounding at least one portion of at least a second compartment being semi-permeable, a water soluble or suspendible product or a concentrated solution or suspension thereof being retained in said second compartment and a water soluble or suspendible product, a drug, a nutritional suspension or powder to be put into solution or suspension is retained in said first compartment. This new self- rehydrating container allows the production of pure solutions of very low molecular weight solutes, of accurately dosed solutions, prevents the oxidation or hydrolysis of the material to be rehydrated and prevents the contamination of the rehydrated material by eventual residual bacteria.
