Abstract: In some implementations, a fluid delivery device includes a compressible dispensing chamber defining a dispensing volume and including a dispensing chamber inlet in fluid communication with a reservoir and a dispensing chamber outlet in fluid communication with an environment. A first one-way valve at the reservoir outlet or the dispensing chamber inlet selectively allows flow of the substance from the reservoir to the compressible dispensing chamber and a second one-way valve at the dispensing chamber outlet selectively allows flow of the substance from the dispensing chamber to the environment. An actuator selectively compresses the compressible dispensing chamber to decrease the dispensing volume and expel the substance in the dispensing chamber through the dispensing chamber outlet.