I also have a gas stove so was ok there too...
I never though too much about losing power (or water) before the quakes, but now I reckon I could happily survive weeks with the food and bottled water on hand. I also have several LED torches around the house and I maintain 20 odd litres of petrol which I cycle out through the cars to keep fresh.
Our services here in NZ are amazingly reliable really, and Chch actually seems to be more reliable than most places despite the quakes - but being prepared never hurt anyone *
Cheers - N
* Except those Prepper nuts. Being prepared to that extent has well and truly hurt their chances of being considered normal.