You can, of course, serve OO7 straight up instead of over ice.
Stir the ingredients, never shake, as the bubbles will dissolve. To add a garnish, use the end of the orange that you just squeezed.
You should use fresh-squeezed orange juice by using a navel or Valencia orange. If you do not have access to fresh oranges, orange juice will work in a pinch. If you can find Blood Oranges, it works well, too.
Use infused vodka. I recommend Blood Orange Sky Vodka, but any brand that has infused oranges will work.
For the soda, use 7UP. You can use any lemon-lime soda if you do not find 7UP.