You have hit the jackpot, coffee is like a godsend to some people. They can't even get out of bed without having a good cup of joe in their hand. So imagine someone just completely winy or in a murdering rage without their cup of joe.

We take coffee for granted and don't think what will happen if we ever run out. I know I need it from time to time to power through writing. So if you save a can or few a few lucky people will see you as their God (litterly my mother would bow and pray to you.)

Through the question is what do you get in return? After all this is a trading business. Depending if you give a whole can or a baggie depends on your pament. A bag might get you  hygiene products, maybe a bug spray. A whole can will be worth a whole lot more. Bug spray,  med supplies, clothing. Either way you'll be leaving with a lot more than what you gave them.