Use Coco Coir as a Potting Medium:

Coir can be used as the soil, and it is available in a ready-to-use form in bags. It is also available in tightly packed, lightweight bricks, that can be expanded up to six times the original size – simply by adding water. Even if you end up adding too much water, don’t worry, excess water just drains off. Also, remember that even when coir feels dry when touched, it retains plenty of water in its tube-like fibres. When using coir instead of soil do not forget to fill each pot loosely with coir, plant and water it well.

For repotting, wet the coir thoroughly, turn the pot upside down and tap firmly while supporting the plant until it slides out. Add little additional coir to the new pot and place the plant in it. Fill the new pot with more coir and water.