To Buy: 
Buy raw, unfiltered vinegar from health stores.
To Store: 
Vinegar is an acid and used as a preservative its shelf-life is almost indefinite. Colour changes, haze and sediment are not an indication of the product deteriorating. Vinegar can be stored in the cupboard.
Tips & Tricks: 
Purported to keep old age at bay. 
Drink 3 glasses of hot water with 2 tsp apple cider vinegar and 2 tsp of honey a day.  
Cooking Tips: 
Make a winter coleslaw with cabbage, grated apple, walnuts and a dressing from apple cider vinegar and olive oil (1 part vinegar to 3 parts oil).