Paulnaude01:
3) If there are 10 people living in each house, we will still not know who's bottle it was, but with 1 bin per house, at least we can narrow it down a bit.
That is one of the unanswered questions. 10 people in one house, but you have to pick one person to report. Which person? The oldest, youngest, shortest, tallest? Whichever person you choose must be the same person for all the houses. You can't pick the youngest for the first house and the oldest for the last.