Get Low - Robert Duvall - Spoiler

I just saw this pretty good movie and was wondering if the lead character actually commits suicide. In one scene they show him sitting on the porch making something. It almost look’s like he’s making coffee by pouring water over grinds. Later he drinks something that looks like tea but judging by his reaction after drinking it, isn’t. He displays his knowledge of herbal/natural medicine to Sissy and his death is pretty well timed.