Pay for food! Pssh! Soggy bacon butty, fried at the crack of dawn while packing, smoking a cigarette and showering. Stuff it into your hopper, fire it into your mouth and keep playing! Otherwise Skirmish Portishead do a competetively priced burger and chips to keep your legs moving.
(Disclaimer: anyone stupid enough to shoot a sandwhich out of their marker deserves whatever ends up in their mouth, namely a breathing tube)