How to share/secur common (food) items in a house hack situation?

[Bruce P.]

Hi BP community,

My friend is doing a house hack in southern California and was wondering if there was a good way to share/secure common items that could be shareable. For example, there is a Keurig coffee machine - should they share the cost of the coffee pods via an honor system jar? (e.g., each tenant promises to put $0.50 in the jar each time they use a cup). 

Is there some sort of small "vending machine" that would accept quarters and drop out the Keurig cups?  Or should some easily common shareable stuff not be shared at all? I can easily see people abusing an honor system.  Thanks in advance for any ideas!