Fresh wasabi is more expensive than the tuna your putting it on. Your other sushi companions include ginger slices which are for cleansing the palate between sushi dishes and the soy sauce which is for dipping. Low sodium soy is available usually in a green container. That s what I ve heard. Usually I order either sake or beer.
Hot sake is usually the house sake while the premium sakes are served cold.
Japanese beers like Saporo or Kirin also go well with the sushi morsels. Sticky rice is Japanese rice that is cooked with water, not steamed. The ratio is 1 cup of rice to 1 cup of water with some rice vinegar. Another good sign is if there are a lot of Japanese patrons. Sushi bars that have more exotic dishes other than the basic sushi are more appealing.