distilled water and copper(II)chloride
https://en.wikipedia.org/wiki/Copper%28II%29_chloride


  Aqueous solution prepared from copper(II) chloride contain a range of copper(II) complexes depending on concentration, temperature, and the presence of additional chloride ions. These species include blue color of $\ce{[Cu(H2O)6]^2+}$ and yellow or red color of the halide complexes of the formula $\ce{[CuCl_{2+x}]^{x−}}$


On the Wikipedia page, you can see a photo of 3 solutions with different colour.