How do you separate oil water and alcohol?

Add some amount of copper sulphate(CuSO4) in the mixture. the water molecules get attracted to CuSO4 molecules and it will turn into blue colour(CuSO4.5H2O) The oil will be in normal colour so you...

because oil is lighter than oil

The pepper can be filtered out with filter paper. The alcohol is trickier, and must be distilled out (see related questions).

Sit and watch. Olive oil is non-polar and water is polar... meaning the two don't mix. They will separate themselves.