Nici Wickes has got a list of things you should have on hand this summer:

Dairy  

Parmesan cheese 

Greek yoghurt 

Sour cream / cream cheese / creme fraiche   
 
Pantry  

Olive oil + sesame oil  

Red wine vinegar 

Tins of guava, salmon, tomatoes, creamed corn  

Sushi rice  - great for sushi & for rice pudding & risotto 
 
Protein  

Quality sausages 

Frozen prawns 

Eggs  

Veges/Herbs/Fruit   

Bunches of parsley & coriander - I'll let you know how to store these so they last all summer long  

Garlic & onions or spring onions  

Lemons lemons lemons 

Tomatoes 

Frozen berries  

Fresh berries, stonefruit, watermelon   

Other 

Flat breads: wraps/tortilla/lebanese bread 

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