Perspective
Whilst what Bus Junkie says can and does happen. The backpacker district, is a pretty rough seedy place in my opinion, so if you venture just a little more upscale rather than squatting on the street, you should have no problem with toilets or soap. Etc
Just check trip advisor and look at the top 100 resturants in Ho Chi Minh, I don't think you will find those complaints..