Drinking water accidentally drink the small cockroach down there is no great effect, usually do not need to deal with, if caused by digestive symptoms can be targeted use of medication.
Cockroaches accidentally eaten, usually not much effect, eaten will be accompanied by the digestive tract is digested and absorbed. Even if the cockroach is with a trace amount of bacteria, it will be digested by stomach acid in the digestive tract or eventually be excreted, so there is no need for special treatment, you can drink more water.
Cockroaches are dirty, with bacteria and other pathogens, if they cause digestive symptoms such as diarrhea, you can use antibiotics such as levofloxacin, safranin and other symptomatic treatment.
Drinking water accidentally drink small cockroaches if you do not feel comfortable, do not have to worry too much, such as worry you can go to the hospital, under the guidance of the doctor reasonable choice of treatment.