If we are away from services longer than a pint of half-and-half will stay “fresh”; say, two weeks in the fridge, we switch to Carnation evaporated milk. Of course, we still have the fridge, so doing that is not really germane to the challenge of a small boat w/o one. But one might get two mornings of use for two coffee drinkers from a 5 fl oz can w/o having to refrigerate after opening it. There also the Mini-Moos. Not that these suggestions are better than ones already offered. But as for other uses, you do need “milk” to make the Mac & Cheese! So you might get that from the evaporated version when time comes, even after two weeks on the hook, etc.