I am a type of punch. Read backward, my last 3 letters are what you are breathing. Add a letter after my first letter, and another letter before my last letter, and you have an imaginary paradise. What am I?

Sangria is a type of punch made from red wine, chopped fruit, sweetener, and a small amount of brandy. The puzzle works: 'sangria' read backward gives 'airignas' - the last three letters are 'gas' (what you breathe), and adding 'ut' after the first letter and 'p' before the last letter gives 'sangutopiria' - which sounds like 'utopia' (imaginary paradise). Aria is an opera song, utopia is itself the imaginary paradise, and bowl is not a type of punch.