Knowing Cave Johnson, the water supply at Aperture Labs was most likely always tampered with in some way. Maybe one month he would test extra fluoride to see if the employees got fewer cavities. Then the next he'd try some chemical that promised to grow a more fetching beard. (And if you were lucky, he only had the lab boys rig up the one in the men's locker room to do that.) That Cave left no Science stone unturned, so water was probably no exception.
Luckily for you, your water supply probably doesn't contain Mantis Men antibodies. But you can still drink like a testing candidate by using these Portal 2 water bottles. The 1970s bottle is glass with a metal lid and features the 1970s Aperture Science logo. Stay hydrated, future Mantis Men and Ladies!