SPOILERS! DON'T LOOK BELOW IF YOU DON'T WANT TO SPOIL THE GAME!
You need level 3 of medicine and a master healer. If you put the master healer in the bath, he will get lotuses to fill the bowls, then put the MASTER HEALER on the fire and he will get the torches to light them and light the bowls of lotus.
Sorry if you didn't want this big of a spoiler.
