In fact, if you drink the wrong water or eat the wrong food, your bowels are going to exact revenge on you big time. But even under normal, non-infectious conditions, regular bodily functions will make it imperative that you design and build proper "bathroom facilities" that won't make you and your party sick by inviting and spreading disease.

So it will become imperative for you and your group to construct adequate field bathroom facilities that you can manage well, that are effective and as sanitary as you can make them so that you don't attract disease.

According to military guidelines, latrines must be built to prevent contamination of food and water. They should be constructed at least 100 yards downwind and down gradient from your food preparation site, and at least 100 feet from any ground water source like a pond or stream.