and water to cook it and drink, and power to heat it?

72 hours of essential supplies. Do you have 72 hours of:

• food (cooked, or cookable? see points 2 and 3)
• stored water (taps out?)
• stored power generation (powers out?)
• medicines and first aid (emergency services outages? communications outages?)
• heat in the coldest months? (see point 3) etc.