1. The husband has to bring his wife to the בית המקדש to be tested to see if she is pure or not. She's tested by drinking bitter water that has Hashem's name erased in it. She also must bring a special קרבן with her.
2. The Kohen Who is offering the special קרבן for the סוטה is forbidden to add oil to the קרבן.
3. The kohen is also forbidden to add spices.