Massed waves of drones dropping vodka by parachute might turn out to be a useful ploy. Bigger drones could delver it by the barrel...
For a start the orcs would refrain from shootiing them down and you'd get to reuse them. The orcs are dispersed enough for Officers and NCOs to be unable to control the resulting debauchery, and many of them would just join in.
Then one night, after a week or so of 'conditioning' you'd follow up the first drop with a second massed wave of bottles full of something that goes bang when opened.
Sounds like a cheap strategy to me.