... after that, you're on your own.
Right there, the general Vault-Co meme of the past ten years confirmed : PACK YOUR RICE so that you will eat when food is scarce. Without clean drinking water you will last three days. Without food you might go a month. Trust me, the reality is that you don't want to go eight hours without either. It will seem like eight years that first day that the guffamint stops returning your calls.