Coffee for us was important, and whenever were were halted for an hour or so (sometimes less) somebody always had a brew on, but in my section there was something even more vital.
BOOZE!
Every last one of us had a hip flask in their pack, each person with something different in it - bourbon, port, tequila, etc. Between us there weren't many cocktails we couldn't make!
Technically we were breaking the rules, but given the platoon sergeant and company sergeant major also carried....
Even the cook could be counted on to have a little something squirrelled away.