Tooth water

Similar to night water, water you drink straight from the tap after brushing your teeth, and it tastes like the freshest mountain spring, and like god himself blessed it upon you. It must come straight from the tap however, and cannot be drunk from a glass/cup/mug.

person 1: hey bro when did you brush your teeth last night?
person 2: about 9:30, and had a nice drink of tooth water