You can store bread in the freezer, defrost the slices you want to use and leave the rest in the freezer. It might help with your bread waste problem. I don't get why you are not using actual towels to dry your hands. And why are you drinking bottled water at home? If there is a problem with your water quality, boil the water it will be usable. Bottled water is a big scam.

Personally I'd tell these wasters that the stuff has got to last. Work out how long it needs to or should last and tell them if it doesn't last for a week or a month, they can do without or pay for it themselves. I think this problem at its core, who ever you are dealing with, doesn't have a respect for money.