Heck yes, just a 12 hour power outage with groceries is a big pain.
Here is also a link to a great 'List of lists'. It is amazing what you can forget , and looking at someone elses list(s) always helps.
Proper planning prevents poor performance, goes the old saying... :
http://survivalblog.com/listoflists.xls
FYI - This link is directly to an Excel xls file. (you can right click it and SAVE it if you don't want it to open in Excel)