Good Hemp, Inc. makes Good Hemp Fizz and CannaHemp beverages, which is a line of naturally flavored waters infused with 10mg of THC-free hemp extract and prebiotic fiber.
There's an app for everything nowadays, including treating anxiety and stress. It's a good option when your problem is not too serious or you can't afford to go to therapy.
Puth has spoken up several times about his social anxiety, his struggles with fame, how he has a hard time dating, but he's very tight lipped about his drug use.