Water spinach with tauco (tumis kangkung tauco)

I found the picture of this dish in my computer. It is probably from  long time ago. The water spinach is not available in MD, can't find them in the Asian Market.

Ingredients:

1 bunch of water spinach (kangkung) cut in 3 cm length
6 pcs of portabello mushroom cut into 2-3 parts
2 garlic; sliced thinly
1 shallot: sliced thinly
2 Thai chilles; sliced
2 tbs of tauco (fermented soy beans)
3 tbs olive oil
1/2 cup water

Directions:

1. Heat the oil in the wok, then add the mushroom, after a while (3 minutes) add the garlic and shallots.
2. Stir in the chilles and the water spinach. Then add the tauco, add water and keep stirring till it is well done.