i'm sure that the powder is either cut or it's crack.
if it's pure cocaine HCl it should dissolve in the water. if it's crack it's been stripped of the HCl molocule and it's insoluable in water.
i'm not sure what that oil could be. it might be the coke in solution, but i always thought it would make a nice clear solution when mixed with water.
but i'm 99% sure that the powder u have at the bottem is the cut.
try seperating the water and the powder at the bottem, let them both dry out, and then bump em and see what happens