I am right handed and my coach told me to maybe carry a left handed club in my bag in case I get behind a tree or something where I couldn't swing right handed. My dad thinks I should just turn my right handed club around and swing left handed. What should I do?

No need to.I am a left handed golfer who has been playing for 30 plus years and I can only think of 3 maybe 4 times that I wished I had a right handed club. In each case I took my putter,Yes putter, and got out of big trouble.You are not going to hit it far but its better than trying to get fancy and maybe even missing the ball completely.One small shot with the putter and you still have a chance at par.Try this, turn your club around and hit the ball and than use your putter.watch the results. Oh by the way I once seen a fellow hit a ball 40 plus yards with his putter to get out of trouble.