Hydroponic is the process of growing plant on the water.
First take a can that don't have hole.
Take the sponge and cut it like a circle that can fit into the can.
Put the water into the can and put the sponge on the surface of the water.
Take some seeds to put on the hand but not too much.
Spread out the seed on the sponge. Few more day your seeds will start to grow. Now is your turn to make it.