what is customary for a long term reservation as far as shampoo, soap, etc.? is it customary to provide just enough to start off with, or for the entire stay. it's going to be a 42 day stay.
As a host it is preferable to provide them with the basic amenities to start off in their stay. If they require a specific item or if they have already used what you have provided, they are responsible of buying their own items.