If you seriously cannot have conversations at this level without them turning into political discussions, you really need to reflect on your conversational habits. It is absolutely not normal or healthy if you can't talk about drinking water without it turning political.
My SO is a vegetarian. It comes up a lot, both with my friends (who are all meat eaters) and newly met people alike, but I seriously cannot think of one single time it has turned into a political issue.
If these topics are frequently turning political for you, it's on you.