How to make a cup of water attracted by a magnet?

First, pour half a cup of water into the cup, then squeeze the juice of four fresh oranges into the cup, and then put three large spinach leaves into the water to make sure they are fully immersed. Alright, put this cup of water in the fridge overnight (otherwise the water will turn green). The next day, carefully take out the spinach leaves, and now you have a cup of magnetic water, all we need now is a strong magnet. Attached is the effect video~