I am moving to Vienna with two cats and I would like to know if there are U.S. brands of cat litter and cat food available. Specific brands would be Tidy Cat, Fancy Feast, Hill's Science Diet, Royal Canin, Purina, Friskies. If not available in store, is there a way to order online from a site like Pet Meds? Also I know that canned tuna is available but can you find it packed in water? Any help you can give is greatly appreciated!