Wash the bok choy thoroughly and cut it into appropriate sizes.
Cut the tofu and button mushrooms into bite-sized pieces.
Slice the garlic thinly.
Pour water into a pot and bring it to a boil.
Once the water boils, add the garlic and button mushrooms, and cook for 2 minutes.
Add the bok choy and tofu, and season with salt.
Boil for another 2-3 minutes, then transfer to a bowl and serve.