To Buy: 
Buy in bottles from a health food store or the health section of your supermarket. Check the ingredients to ensure you are buying a good quality product. Look for labelling that states it's naturally brewed or organic. 
To Store: 
Once opened store in the fridge for up to 12 months. 
Tips & Tricks: 
Watch out for poor quality commercial tamari and soy sauce products with additives including hexane - a petroleum derivative, genetically engineered enzymes, caramel colouring, hydrochloric acid and sugar. 
Cooking Tips: 
Tamari has a stronger flavour than shoyu. It is excellent in marinades and salad dressings, to flavour grilled food, and on the table as condiment or dipping sauce.