http://www.ebay.co.uk/itm/Augason-Farms-Premium-One-Year-Food-Storage-Kit-includes-a-Wheat-Grinder-and-/120944592221?pt=LH_DefaultDomain_0&hash=item1c28dc055d this might be the answer if you run out of stuff when you are away
so you can feed yourself for an year for Approximately £1,005.93 that works out as £19.35 a week !!!!!!!!!!!! bek
If you grow your own food or buy in bulk then a dehydrator is a very usefull kitchen appliance to have and you can also make awesome jerky and fruit leathers Foods that preserve well for a long time are an aquired taste to the modern pallette though