How much Brew do we need to bring for the swap?

 

Need is an inappropriate word. Try using "get", "want" or even "have the privilege"

The choice is your's and your's alone. There is no set limit or even obligation. Just an opportunity to let others try some of your favorites or local stuff and reciprocate the cheer and good will. Totally informal and merely social in nature - no pressure (you'll be at 9,500 ft so how much pressure could there be anyway?).