Heidi Gardner and William H. Macy are ready to make a splash with their forthcoming dramedy feature. Gardner and Macy are set to star in the indie film The Swimming Lesson from writer-director Casey Twenter, The Hollywood Reporter has learned. Production is scheduled to begin this summer in Gardner’s hometown of Kansas City. The Swimming Lesson centers on Tay (Gardner), a single mother who leaves behind her complicated life in Los Angeles to return to her childhood home. She winds up embroiled in a custody battle over son Albee, an autistic child who is obsessed with the ocean but terrified of swimming. Macy co-stars as Leonard, Tay’s foul-mouthed father whose blunt nature can sometimes disguise the fact that he remains loyal to his daughter and grandson. Making his solo directorial feature debut, Twenter helmed the project from a script he co-wrote with Jeff Robison. Twenter and Robison previously co-wrote the 2014 drama Rudderless, which marked Macy’s directorial debut and landed distribution after premiering at Sundance. The Swimming Lesson’s producers include Dan Koetting for KP’s Remain …