I do the same as Honey74 and make sure just to stock up on everything I normally use (AH Cous Cous, SuperNoodles, Basmalti Brown Rice, Pasta, Passata, Quark, Yogurts, Alpen Lights, Fibre Bars, All Bran Cereal, hot Chocolate, Total 0% yogurts, fresh fruit and veg, spices, freezer with different cuts of fish/lamb/chicken, Quavers, Skimmed Milk-longlife, wholemeal bread, ryvita wg crackerbread, mayo, ketchup, coke zero or diet coke, Quorn products, ice creams (mini twisters, minimilks)...and the list goes on...
That way I can change at the last minute if I want to have an EE, Red or Green Day.