You are way too sketch. I used to have a bong and I would use it at night in my room with my parents home, and after I was done I would just pour the water into a water bottle and hide the water bottle behind a drawer in my dresser. I would keep using new bottles until I had the chance to dump them one day. It's pretty simple really, but it may be easier for me because I have a fridge in my room so I always have bottles laying around my room. Get a funnel if its messy or something.