The first location you will need to go to find the second acolyte is the swamp. For this one just look around till it triggers.
Then for the second location for the third acolyte go to the forest pond during the day and the other acolyte should be there. If the pond is not an option you need to explore the forest till you find it.
(super sorry for leaving you hanging in the other message I hadn't seen your reply till today)