A coupling system for a fluid module (100) of an expandable fluid distribution system is provided. The coupling system includes a first coupling side (104) of the fluid module (100) with a female coupling part comprising an aperture (105) and a shoulder (108) and a male coupling part comprising a coupling tab (106) extending from the base (101). The coupling system also includes a second coupling side (204) of the fluid module (100) with a female coupling part comprising a slot (206) sized and shaped to receive at least a portion of the coupling tab (106) of an adjoining fluid module and a male coupling part comprising a fluid stem (205) and an engagement rim (208) sized and shaped to engage the shoulder (108) of an adjoining fluid module.