Food is important, its one of the big three for survival. I am just saying what Doc says is right. By having a plan and doing your homework, finding safe places to cache, setting up safe house's ect. will help you be successful. But your tactics should not include frontal assault of say a Bradley or a well trained and supplied infantry unit. Doing a good job with Recon and hitting the target at the moment its most vulnerable will get you supplied and keep you alive.