The vast majority of anemones do not survive in captivity. Despite that fact, many people are lured into starting marine aquaria by the fascinating relationship between the clownfish and their host anemones, generally its a bad idea to purchase one until we learn more about how to keep them alive.
Your particular clownfish DOES NOT require a host anemone. Instead try certain corals such as Xenia, Open Brains, or Leathers if you want to see it cozy up to something.
Finally, I applaud your idea for getting it a mate/friend. They seem to enjoy the companionship of each other.