We anticipate taking our own drinks unless told otherwise. Also if we invite someone over we make it clear if we are supplying the refreshments or they should bring their own.
Nobody takes offense, everybody understands budgets.
There may also be long periods with just Ed and me. Bring games, hobbies, lots of books, write letters, etc. I find that as much as I enjoy solitude that I really miss the stimulation of other people, so a little socializing gives me the fix my brain needs and a break from being with just 1 person. We went most days because we enjoyed it, but often didn't. Bottom line is you can socialize a lot if you want but there is very little pressure if you don't.