Munching sunflower seeds is pretty universal for this job. A lot of people dip as well, but I never did simply because I have an addictive personality. Both require you to bring along a bottle (20 oz Gatorade works best), which I'd still recommend it for dipping (see woogies post), but skip it for airsoft.
As a side note, sunflower seeds are carried Navy Corpsmen. When someone is getting dehydrated you tell them to sip water and suck sunflower seeds. The salt content helps your body retain the water you're taking in.
As a side note, sunflower seeds are carried Navy Corpsmen. When someone is getting dehydrated you tell them to sip water and suck sunflower seeds. The salt content helps your body retain the water you're taking in.