Ignorance is bliss. Maybe should carry your own plastic cups when travelling. Then you know what you are drinking from. I am sure there are many less than ideally hygienic practises being used.
I remember when I had a dish washing job in a restaurant while in high school. I actually observed a cook drop a steak on the floor, pick it up and throw it on the grill.
When I was still in the military and we were here in Thailand for some training with the Thai military we were put up in an empty barracks building. The shower room was behind the barracks. We had been using it for about 5 days. Then the medic told us he believed the water was coming from a source that sewage fed into. The next day 4 members of our group of 10 got sick.