> my strategy is to only go shopping at supermarkets when [...] and i already have enough food back at home to survive with out needing to go grocery shopping for a few days.

Great strategy, but if you ever have interruptions that cause you to empty out the larder, you will then starve since you can't shop.

Oh, wait... you're probably a human being not a computer program. Sorry: it's a kind of a reflexive code review process for me by now.