Describing his pre-show rituals, the two-time Grammy winner says: "I always eat a healthy meal. Then I warm up my body with a short yoga routine and I warm up my voice with music - I sing.
"I make myself a strong cup of mint tea with a very delicious syrup in it - it's called Nin Jiom Pei Pa Koa."
He will have no problems stocking up on the Chinese herbal syrup when he comes to Singapore to perform at The Star Theatre on Nov 17 and 18.
These may be among his last shows. In recent interviews, he has announced that he wants to retire before turning 40. "Nothing will make me change my mind. I'm looking forward to it," he says of his plans to bow out of the music industry and focus on tending his farm in California and doing charity work.
The two gigs in Singapore come 2½ years after his last performance here at Gardens by the Bay.
While that show was a full-on concert - and part of the garden's opening celebrations - his new shows will see him go acoustic for a more intimate feel.
He adds: "This time I'm bringing with me Raining Jane - they are the collaborators in my new album, Yes!. And it's their first time in Singapore so it's a brand new show."
Yes!, released in July, is Mraz's fifth full-length release and his first acoustic album.