Fruit fly or cupboard moth, maybe. I've had trouble over the years with them. Once I started cleaning the taps with sanitizer after every use, end of trouble. Get a baby bottle nipple brush and keep it in a glass of sanitizer nearby.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk