Those are excellent questions and he should definitely ask his urologist about that; I start BCG next week and what my urologist told me (because I had very similar questions) is this (but again - it may not apply to your father so he should ask his urologist):
1. Obviously try to urinate only into the toilet or a urinal; and then put two cups of bleach into the toilet for 15 minutes before flushing (and put some in the urinal as well - 1/2 cup suffices).
2. Wear white clothing so that if there is some "seepage" onto the clothing (underwear, whatever), it can be washed with bleach; whoever does the washing needs to use gloves to avoid contamination.
I did not ask about Depends so I don't know what the proper protocol would be for decontaminating them.
Certainly wish your father the best, I hope everything works out for him (and you)!
T1 high grade transcell diagnosed 8/14/2015
TURBT 8/21/2015, removed tumor (17mmX14mmX11mm)
Repeat TURBT performed 9/25/2015
Pathology Report: no residual cancer detected
BCG planned starting in October