A modular fluid dispensing system includes a rigid bottle and multiple swappable base units. The modular fluid dispensing system includes a bottle housing to house a rigid bottle, a dispenser to dispense the fluid, and an attachment mechanism to reversibly affix the modular fluid dispensing system to a support structure. The bottle housing includes a threaded fastener to form a seal with the rigid bottle and a puncturing taper to puncture a seal of the rigid bottle. The dispenser includes a pump to initiate flow of the fluid from the rigid bottle and out a nozzle in response to a command signal from a sensor. The dispenser also includes a vacuum break port to allow an external fluid to replace the fluid in the bottle and prevent formation of a vacuum.