If you don't want to worry about it at all, buy a brined cheese such as parmigiano reggio - (real parmesan cheese in a block) it's
expensive, but delicious, and basically keeps "forever"

I typically take a hunk of Parmigiano Reggio - I used to take come cheap cheddar, but in my more mature years I have a bit more cash and as such have become somewhat of a high class princess